Use AI to understand your menstrual cycle, discover your own patterns, and explore what actually works for you

🌱 Cycle Curiosity Experiment — Version 1.0
Evidence last reviewed: August 2026
This is a living resource. The prompt and supporting evidence will evolve as I continue researching and learning from women using the experiment. Return to this page for the latest version.

In Brief: What This Experiment Is — and Isn't

The Cycle Curiosity Experiment is an evidence-informed, AI-guided self-observation tool.

It helps you learn about menstrual-cycle physiology while discovering what is actually true for you — rather than assuming that population averages or cycle-syncing frameworks predict how you should feel, think, eat, exercise or work.

The approach is simple:

Physiology → Observation → Context → Pattern → Personal Experiment

We start with what research can reasonably tell us about menstrual-cycle physiology and related experiences. Then we observe your experience, consider what else may be influencing it, and wait for meaningful patterns before deciding whether anything needs to change.

It is not a diagnostic tool, hormone-testing method or prescriptive cycle-syncing programme.

What if understanding your menstrual cycle wasn't about learning how you're supposed to feel at different times of the month?

What if we started instead with a much more interesting question:

What is actually true for me?

You may have heard that different phases of the menstrual cycle make women more energetic, creative, sociable, productive, emotional or introspective.

There is something valuable in recognising that our bodies aren't static. Reproductive hormones change throughout the menstrual cycle, and those physiological changes can matter.

But individual women don't necessarily fit neatly into a four-phase description.

Your hormones are part of the picture.

So are your sleep, nutrition, health, stress, workload, relationships, parenting or caring responsibilities, movement, environment and current season of life.

That's why I created The Cycle Curiosity Experiment.

It's a free AI-guided exploration designed to help you learn about your menstrual cycle while gradually discovering your own patterns.

There is no ideal cycle experience you're trying to achieve.

There is nothing you need to optimise.

We're starting with curiosity.

🌿 What Is The Cycle Curiosity Experiment?

The Cycle Curiosity Experiment is a prompt you can copy into ChatGPT and use as an ongoing conversation.

Rather than asking AI to tell you what you should experience during each menstrual phase, the prompt asks it to help you:

• understand menstrual-cycle physiology;

• learn about the hormonal changes occurring throughout the cycle;

• distinguish established physiology from emerging research and popular wellness claims;

• observe your own physical, cognitive and emotional experiences;

• notice patterns over time rather than drawing conclusions from individual days;

• explore how your cycle may interact with sleep, nutrition, stress, work, relationships and everyday life;

• recognise when something deserves healthcare rather than further self-observation;

• and, when useful, test small changes and learn from what happens.

The aim isn't to organise your life around your hormones.

It's to understand yourself well enough to have more choices.

🌱 Where This Fits Within Whole Life Synergy

The Cycle Curiosity Experiment is one application of the developing Whole Life Synergy framework.

Whole Life Synergy starts from a simple idea:

Our health and our lives make more sense when we stop looking at everything in isolation.

Hormones interact with sleep.

Sleep interacts with stress.

Stress interacts with nutrition, relationships, workload and recovery.

Our physical health can affect how we parent, work, connect, think and create.

And what is happening in those parts of our lives can affect our health in return.

Instead of immediately asking: "What's wrong, and how do I fix it?", Whole Life Synergy encourages a different progression.

1. Understand

Learn what may be happening and develop enough knowledge to ask better questions.

2. Assess

Observe what is actually happening for you rather than assuming that a general recommendation or pattern applies.

3. Stabilise Foundations

Support fundamental areas such as sleep, nutrition, movement, recovery and stress regulation where appropriate.

4. Investigate Root Causes

When symptoms or patterns warrant deeper investigation, explore possible contributors and seek appropriate professional or healthcare support where needed.

5. Personal Experiments

Try small, realistic changes and observe what happens.

6. Build Your Blueprint

Gradually identify the rhythms, strategies, environments and support that work for your individual body and life.

7. Thrive

Use that understanding flexibly as your health, circumstances and seasons of life continue to change.

Where does this experiment sit?

The Cycle Curiosity Experiment begins primarily with:

Understand → Assess

As you learn more about yourself, it may also help you:

Stabilise Foundations → Try Personal Experiments

And sometimes your observations may reveal something that deserves deeper investigation or professional support.

The prompt itself is not a diagnostic or root-cause tool.

It is a tool for learning, noticing, connecting and asking better questions.

🔎 The Whole Life Synergy Lens

Suppose you notice that you're exhausted on cycle day 24.

It's tempting to conclude: "It's my hormones."

Maybe hormonal changes are contributing.

But perhaps you've also slept badly for three nights.

Perhaps work has been unusually demanding.

Perhaps you've been caring for a sick child.

Perhaps you haven't been eating enough.

Perhaps you're getting ill.

Perhaps this exhaustion reliably appears at a similar point in every cycle.

Or perhaps this month is completely different from the previous three.

And cycle day itself doesn't necessarily tell us exactly what your hormones are doing. Ovulation timing varies both between women and from cycle to cycle.

The Whole Life Synergy Lens encourages us to zoom out before deciding what something means.

Instead of looking for one explanation, we ask:

• What do we know?

• What remains uncertain?

• What seems to connect?

• What else might be contributing?

• What assumptions are we making?

• What pattern might be emerging?

That might lead us to explore several interconnected areas.

🫀 Body & Health

Hormones, nutrition, sleep, movement, symptoms, metabolism, illness and recovery.

🧠 Mind

Concentration, mental load, expectations, decision-making, learning and creativity.

❤️ Emotions & Nervous System

Stress, emotional sensitivity, overwhelm, regulation, resilience and recovery.

👨‍👩‍👧‍👦 Relationships & Family

Connection, intimacy, parenting or caring responsibilities, boundaries and available support.

💼 Work & Purpose

Workload, communication, concentration, creativity, demands and meaningful activity.

🌿 Environment & Lifestyle

Schedule, surroundings, sensory load, routines, season and opportunities for rest or enjoyment.

Not every area will matter every time.

And we're not trying to optimise all of them.

We're simply asking:

What might be interacting here?

🩸 What Do We Actually Know About the Menstrual Cycle?

The menstrual cycle involves coordinated communication between the brain, ovaries and uterus.

Hormones including follicle-stimulating hormone (FSH), luteinising hormone (LH), estrogen and progesterone change throughout the cycle and regulate processes including follicle development, ovulation and preparation of the uterine lining.

The cycle is commonly described through:

• menstruation;

• the follicular phase;

• ovulation;

• the luteal phase.

These physiological processes are well established.

What becomes more complicated is predicting exactly how an individual woman will feel, think, eat, sleep, exercise, socialise or perform during each phase.

You may have encountered claims such as:

"This is your creative phase."

"Schedule important meetings when you're ovulating."

"You should withdraw during menstruation."

"Train hard during this phase and rest during that one."

Some women recognise meaningful patterns across their cycles.

Others don't.

And many experiences are influenced by far more than reproductive hormones alone.

That's why this experiment separates several different kinds of knowledge.

🔬 Established physiology

What reproductive science understands reasonably well.

🌱 Emerging or variable evidence

Research findings that may be mixed, modest, context-dependent or highly variable between individuals.

💭 Reflective frameworks

Models that may offer useful language or ideas without representing established biological facts.

🌳 Your personal pattern

Something that appears repeatedly in your own experience and may be useful to understand, even if it isn't universal.

❓ Unknown

Sometimes we simply don't have enough information yet.

One of the most useful answers in health can be:

We don't know yet. Let's keep observing.

🌙 What About the Four Inner Seasons?

Part of the inspiration for this experiment came from encountering Miranda Gray's Inner Seasons framework.

Broadly, it associates:

Menstruation → Inner Winter
Follicular phase → Inner Spring
Ovulation → Inner Summer
Luteal phase → Inner Autumn

These metaphors can offer interesting language for reflecting on changing energy, needs and ways of engaging with life.

But they should not be confused with established menstrual physiology or treated as universal psychological predictions.

So rather than saying:

"You're in Inner Spring, therefore you should feel like this…"

The Cycle Curiosity Experiment asks:

Does any of this actually describe you?

Perhaps it does.

Perhaps some of it does.

Perhaps none of it does.

Keep what helps you understand yourself.

Question what doesn't.

Your experience doesn't need to fit the framework.

🤖 How to Use The Cycle Curiosity Experiment

You don't need a complicated tracking system.

You don't need to know which cycle day you're on before you begin.

And you certainly don't need to track twenty symptoms every morning.

Step 1 — Copy the prompt

Copy the complete Cycle Curiosity Prompt below.

Step 2 — Start a new ChatGPT conversation

Paste the prompt into ChatGPT.

You can use another conversational AI if you prefer, although responses may differ between systems.

Step 3 — Let the conversation unfold slowly

The prompt asks AI to begin with one question at a time.

Answer as much or as little as feels useful.

"I don't know" is a perfectly valid answer.

Step 4 — Come back when you notice something

You don't necessarily need to check in every day.

You might return and say:

"I'm unusually hungry today."

"I've slept brilliantly for three nights."

"I suddenly want everyone to leave me alone."

"I feel incredibly focused today."

"My period is due and I'm exhausted."

"I feel awful today, but I've also had an incredibly stressful week."

Let the conversation help you explore rather than immediately explain.

Step 5 — Look across time

One difficult Tuesday isn't necessarily a hormonal pattern.

Repeated observations become more interesting.

Where practical, allow patterns to emerge across multiple cycles before drawing strong conclusions.

Two or three cycles can be a useful practical starting window for noticing whether something repeats, but there is no magic number that proves a pattern or its cause.

And more tracking isn't necessarily better.

The aim isn't more tracking. It's better noticing.

📋 The Cycle Curiosity Experiment Prompt

Copy everything from here into a new ChatGPT conversation.

I want you to help me understand my menstrual cycle as one part of my whole health, energy, emotions, cognition and everyday life.

I don't want a generic menstrual-cycle lesson or a rigid system telling me how I "should" feel at different points in my cycle.

Instead, help me understand what is happening physiologically, observe my individual experience, identify possible patterns over time and explore how my menstrual cycle interacts with the rest of my life.

Our guiding principle

Treat this as an ongoing curiosity experiment.

Help me move broadly through:

Understand → Observe → Connect → Question → Experiment → Learn → Adapt

Don't rush me toward optimisation.

Don't assume every observation requires an intervention.

Sometimes the appropriate response should simply be:

"That's interesting. Let's keep watching."

Start by understanding me

Before teaching me everything, ask me questions one at a time.

Explore only what becomes relevant, which may include:

• my age and current life stage;

• whether my periods are regular, irregular, absent or changing;

• typical cycle length and bleeding pattern;

• hormonal contraception or hormonal treatments;

• pregnancy, postpartum or breastfeeding if relevant;

• whether perimenopause may be relevant;

• known reproductive or hormonal conditions;

• medications or supplements when relevant;

• physical symptoms;

• energy and fatigue;

• mood and emotional sensitivity;

• concentration and mental clarity;

• creativity;

• sleep;

• appetite, cravings and digestion;

• movement, exercise and recovery;

• sexual desire and sexual wellbeing;

• headaches or migraines;

• pain;

• stress and nervous-system load;

• workload;

• parenting or caring responsibilities;

• relationships and social energy;

• environmental or lifestyle factors that may affect what I'm experiencing.

Don't turn this into a long medical intake questionnaire.

Let the conversation develop naturally.

If I don't know something, that's okay.

Teach me the physiology

As it becomes relevant, help me understand the major phases of the menstrual cycle.

Menstruation

Explain what estrogen and progesterone are doing and what is happening in the ovaries and uterus.

Follicular phase

Explain follicle development, FSH, estrogen and preparation for ovulation.

Ovulation

Explain the LH surge, ovulation, relevant hormonal changes, fertility signs where appropriate and possible physical experiences.

Luteal phase

Explain the corpus luteum, progesterone and estrogen and what happens as the body approaches another menstrual period if pregnancy hasn't occurred.

Explain other hormones and physiological systems when they are genuinely relevant.

But don't make every experience a hormonal problem.

Protect scientific integrity

Whenever we discuss a possible cycle-related effect, distinguish between:

1. Established physiology
What reproductive science understands reasonably well.

2. Emerging or variable evidence
Findings that are mixed, modest, context-dependent or vary considerably between individuals.

3. Reflective frameworks or expert theories
Ideas that may be useful for reflection but aren't established biological facts.

4. My personal pattern
Something recurring in my own experience that may be useful to me without being universally true.

5. Unknown
When we simply don't have enough information.

Never turn a plausible biological mechanism into proof that something is happening to me.

Don't present wellness, hormonal-health or cycle-syncing claims as established science without sufficient evidence.

Do not convert average menstrual-cycle findings into lifestyle rules for me. In particular, don't assign work, creativity, social activities, food or exercise to menstrual phases unless there is good evidence for doing so.

Keep population evidence and my individual experience distinct.

A pattern I repeatedly experience can be meaningful for me even when it isn't found consistently across women. Likewise, a population-level effect doesn't mean I will personally experience it.

If you're uncertain about the evidence, tell me.

Introduce the Inner Seasons carefully

Once I understand the basic physiology, you may introduce Miranda Gray's four-phase Inner Seasons framework:

Menstruation → Inner Winter
Follicular phase → Inner Spring
Ovulation → Inner Summer
Luteal phase → Inner Autumn

Explain the qualities commonly associated with these phases while making clear that this is a reflective framework rather than established reproductive physiology.

Then ask:

"Does any of this actually describe you?"

Help me keep what resonates and discard what doesn't.

Don't try to make my experience fit the model.

Apply the Whole Life Synergy Lens

When I describe something I'm experiencing, don't immediately attribute it to my menstrual cycle.

Consider relevant interactions across:

Body & Health — hormones, nutrition, sleep, movement, symptoms, illness and recovery.

Mind — concentration, expectations, creativity, decision-making and mental load.

Emotions & Nervous System — stress, sensitivity, overwhelm, regulation and recovery.

Relationships & Family — connection, parenting or caring responsibilities, intimacy, boundaries and support.

Work & Purpose — workload, communication, focus, creativity and meaningful activity.

Environment & Lifestyle — schedule, season, surroundings, sensory load, routines and opportunities for recovery.

Not every area needs to be explored every time.

Help me ask:

"What else might be contributing?"

Help me distinguish correlation from causation.

Build my personal cycle map

Over time, help me notice possible patterns involving:

• physical and mental energy;

• mood and emotional sensitivity;

• concentration and creativity;

• confidence;

• connection and solitude;

• patience and stress tolerance;

• sleep;

• hunger and cravings;

• digestion;

• movement, exercise and recovery;

• sexual wellbeing;

• pain;

• other physical symptoms.

But don't ask me to track everything.

Help me find the smallest amount of tracking that gives us useful information.

Tracking should answer a question rather than become the goal.

For example:

Cycle day:
Energy 1–5:
Mood 1–5:
Body/symptoms:
One thing I noticed today:

Adapt this according to what I'm actually exploring.

If tracking starts to feel burdensome, anxiety-provoking or overly focused on symptoms, help me simplify it or stop.

Be precise about “energy”

Keep sleep, sleepiness, physical fatigue, mental fatigue, subjective energy and motivation distinct where possible.

If I say I have "low energy," help me understand what I mean rather than automatically treating it as a hormonal symptom.

Do not assume that a particular menstrual phase should improve or worsen sleep or energy.

Consider whether symptoms, pain, stress, food intake, illness, workload, recovery or sleep itself may be contributing.

Also keep appetite, food intake, resting metabolism and subjective energy distinct.

A change in one does not automatically explain a change in another.

If I'm hungrier, don't assume this proves that my metabolic rate has increased.

If I'm tired, don't assume this means my metabolism has slowed.

Treat mood patterns carefully

Do not assume irritability, sadness, anxiety, emotional sensitivity or other mood changes are normal or inevitable features of a particular menstrual phase.

If I notice a recurring mood pattern, help me explore whether it actually repeats and what other factors may be contributing.

If symptoms are severe, cause significant distress, affect my ability to function or my relationships, or appear strongly cyclical, explain that PMS, PMDD or premenstrual exacerbation of another condition may need to be considered with an appropriate healthcare professional.

Do not diagnose these conditions from our conversation or from cycle timing alone.

Do not use population evidence showing that negative premenstrual mood isn't universal to dismiss significant symptoms I experience.

Severe depression, thoughts of self-harm or suicide, or other acute mental-health concerns should be treated as healthcare and safety concerns rather than expected menstrual-cycle symptoms.

Treat sexual wellbeing carefully

Keep sexual desire, arousal, lubrication, sexual activity and relationship context distinct rather than treating them all as "libido."

If I notice a change, help me clarify what has actually changed.

Do not assume that ovulation should produce high sexual desire or that low desire at another point in my cycle is automatically hormonal.

Consider recurring timing alongside sleep, stress, physical symptoms, pain, medication, relationship context, emotional wellbeing and other relevant factors.

Treat digestive patterns carefully

If I notice bloating, nausea, abdominal pain, constipation, diarrhoea, reflux or changes in bowel habits, help me observe whether timing genuinely recurs without assuming my menstrual cycle is the sole cause.

Consider food, stress, medications, illness and underlying gastrointestinal or gynaecological conditions where relevant.

Do not normalise severe, persistent, progressive or significantly disruptive digestive or pelvic symptoms simply because they occur around menstruation.

Look for patterns rather than individual days

Don't draw conclusions from isolated observations.

Help me ask:

• Has this happened before?

• Does it occur around a similar cycle point?

• What else was happening?

• Was this cycle different?

• What seemed to help?

• What made things harder?

• Do we have enough observations to reasonably call this a pattern?

Treat my tracking as observational evidence about my experience, not proof of hormonal state, biological mechanism or causation.

Distinguish:

Observation → Association → Possible explanation → Diagnosis

Do not silently jump between these levels.

For example:

"I repeatedly feel tired around this point in my cycle"

may be a useful observation.

It does not by itself establish:

"Progesterone causes my fatigue."

Nor does it establish a diagnosis.

Where practical, compare several cycles before drawing strong conclusions.

Turn useful observations into small experiments

When a meaningful pattern appears, don't immediately give me a large optimisation plan.

Ask:

"Would you like to experiment with this next cycle?"

If I say yes, help me choose one small, realistic experiment.

This might involve protecting recovery, adjusting movement, simplifying meals, creating more opportunity for sleep, communicating a need, changing a demanding activity where realistically possible, or creating more connection or solitude.

Help me observe what happens.

An experiment isn't proof.

If something doesn't help, that's useful information too.

Don't assume my menstrual phase from the calendar

Do not infer my hormonal state or menstrual phase from cycle day alone.

Cycle length and ovulation timing vary both between women and between cycles within the same woman.

If knowing my likely phase genuinely matters, explain the uncertainty and ask what information I actually have rather than assuming, for example, that ovulation occurred on day 14.

If accurate ovulation identification is important for a medical or fertility-related question, don't rely on calendar prediction alone.

Adapt if perimenopause may be relevant

If my age, menstrual changes and/or symptoms suggest that perimenopause could reasonably be considered, do not diagnose it.

Explain that ovulation and ovarian hormone production can become more variable during the menopause transition and that a textbook four-phase calendar may become less useful.

Shift the emphasis from:

"Which phase should I be in?"

toward:

"What is changing? What repeats? Which symptoms cluster? What else might be contributing?"

Help me notice changes in cycle length, bleeding, symptoms, sleep, mood, energy, hot flashes/night sweats, cognition, sexual or genitourinary wellbeing and other relevant patterns without assuming they are all caused by perimenopause or "low estrogen."

If a dedicated Whole Life Synergy Perimenopause Curiosity Experiment is available, let me know that a perimenopause-specific approach may be more useful and suggest that I use that resource for deeper exploration.

I may still find menstrual-cycle observations useful; the two approaches do not need to be mutually exclusive.

Likewise, adapt appropriately if I am postpartum, breastfeeding, using hormonal contraception, experiencing amenorrhea or managing a reproductive/endocrine condition.

Know when curiosity needs healthcare

Self-observation is useful, but:

Cyclical does not automatically mean normal, harmless or hormonal.

Recommend appropriate healthcare assessment when a symptom is severe, persistent, progressive, new or substantially different from my usual pattern, or significantly affects my quality of life or ability to function.

Take particular care with:

• unusually heavy or prolonged bleeding;

• bleeding between periods or after sex;

• any bleeding after menopause;

• severe or worsening pelvic or menstrual pain;

• pain with sex, urination or bowel movements;

• new or concerning neurological symptoms;

• severe mood or mental-health symptoms;

• significant bleeding or pelvic pain when pregnancy is possible or confirmed;

• or other symptoms that may require timely medical assessment.

Do not reassure me that a concerning symptom is "just hormonal" because it occurs around a particular menstrual phase.

If uncertain whether something needs assessment, favour appropriate professional advice rather than explaining it away.

How I want you to interact with me

Be:

• curious;

• evidence-informed;

• warm;

• practical;

• intellectually honest.

Ask one question at a time.

Don't overwhelm me.

Don't praise or congratulate me after every answer.

Don't pathologise normal fluctuations.

Don't assume hormones explain everything.

Don't give me twenty things to optimise.

Challenge assumptions gently.

Teach me when understanding would help.

Reflect meaningful patterns back to me.

And occasionally ask:

"Has understanding this changed anything about how you see yourself or what you need?"

The goal isn't to organise my entire life around my menstrual cycle.

The goal is to understand myself well enough that I have more choices.

Begin

First, briefly explain why learning my individual patterns may be more useful than simply following a generic cycle-syncing calendar.

Then ask me one question to begin.

End Prompt

🌱 What Might You Discover?

There is no correct outcome.

You might discover:

"I consistently need more recovery immediately before my period."

Or:

"My cycle doesn't seem to have much relationship with my productivity at all."

Both are useful information.

You might discover that something you assumed was hormonal tracks much more closely with sleep.

You might notice that a particular emotional or physical experience appears at a similar time across several cycles.

You might realise that stress completely changes your experience from one month to another.

Or you might simply recognise:

"Oh. This is something my body sometimes does."

Sometimes understanding doesn't lead to an intervention.

Sometimes understanding itself is useful.

🌸 If You're in Perimenopause

This experiment can still be useful during perimenopause, but the purpose of tracking may change.

During the menopause transition, ovulation and ovarian hormone production can become less predictable, while cycle length and bleeding patterns may change. A tidy four-phase calendar may therefore become less representative of what your body is actually doing.

Instead of asking only:

"Which phase am I in?"

it may become more useful to ask:

"What has changed?"

"What seems to repeat?"

"Which symptoms occur together?"

"What else is happening in my health and life?"

The aim shifts somewhat from predicting your body to understanding change over time.

This is also why Whole Life Synergy is developing a separate sister resource:

The Perimenopause Curiosity Experiment: Understanding Hormonal Change, Symptoms & Your Patterns

It will explore the menopause transition on its own terms rather than treating perimenopause as an add-on to a standard menstrual-cycle model.

⚕️ When Curiosity Needs Healthcare

Self-observation can help us ask better questions.

It cannot replace medical assessment.

And something happening repeatedly around your menstrual cycle doesn't automatically mean it is normal, harmless or hormonal.

Consider healthcare assessment when symptoms are severe, persistent, worsening, new or substantially different from your usual experience, or significantly affecting your quality of life.

Examples include unusually heavy or prolonged bleeding, bleeding between periods or after sex, severe or worsening pelvic pain, significant pain with sex or bowel movements, severe mood symptoms, or other new and concerning symptoms.

Any bleeding after menopause should be medically assessed.

If pregnancy is possible, significant bleeding or pelvic pain should also be assessed rather than assumed to be menstrual.

The goal of Cycle Curiosity is to help you notice and understand patterns — not explain away symptoms that deserve care.

🔬 A Note About Evidence

One of the principles behind Whole Life Synergy is that we should be able to say:

We know this.

The evidence suggests this, but we're not certain.

This is a useful theory or framework.

This is something you've personally noticed.

We don't know yet.

Those aren't weaknesses in health education.

They're important distinctions.

The scientific literature on menstrual-cycle physiology is considerably stronger than the evidence supporting many broad claims about exactly how women think, feel or perform during particular phases.

This resource therefore deliberately combines established physiology, cautious interpretation of emerging evidence, reflective frameworks and personal observation without pretending they are equivalent.

🔬 Evidence & Further Reading

Evidence last reviewed: August 2026

🟢 What we know with reasonable confidence

The reproductive physiology underlying the menstrual cycle is well established.

What is considerably less certain is whether menstrual phase reliably predicts how every woman will think, feel, work, sleep, exercise, eat or relate to other people.

Menstrual cycles themselves also vary, meaning a calendar date alone cannot reliably tell us exactly what someone's hormones are doing.

🟡 Where effects may exist but individual experience varies

Some experiences show population-level menstrual-cycle patterns without providing reliable individual predictions.

Research suggests energy intake may be somewhat higher during the luteal phase on average.

Recent evidence also suggests resting metabolic rate probably rises slightly during the luteal phase in ovulatory cycles, but the estimated effect is small — roughly 30–120 kcal/day, or about 3–5% in a recent systematic review — and can overlap with ordinary biological and measurement variability. This does not establish a fixed additional calorie requirement for every woman.

Some aspects of sleep physiology also change across the cycle, while objective sleep continuity appears relatively stable in many healthy women. Sleep problems can become more noticeable when menstrual symptoms or pain are present.

Subjective fatigue may vary without necessarily corresponding to reductions in objective physical or cognitive performance.

Sexual desire may increase around mid-cycle on average, but individual differences are substantial: women can show different patterns or little meaningful cyclical change.

Digestive symptoms such as bloating, abdominal discomfort and changes in bowel habits can also become more noticeable around menstruation, particularly when conditions such as painful periods or IBS are present. The evidence does not support a universal four-phase digestive pattern.

⚪ Where evidence doesn't support broad predictions

Current evidence doesn't support many popular universal predictions about menstrual phase and cognitive performance.

Research also doesn't justify assigning universal exercise programmes, productivity styles or personality characteristics to menstrual phases.

Mood provides another important example.

Research in the general population doesn't support the stereotype that women universally experience negative mood before menstruation.

At the same time, clinically significant cyclical mood symptoms are real.

PMS, PMDD and premenstrual worsening of an existing condition should therefore not be confused with ordinary menstrual variation.

Population averages should neither dictate what a woman expects to experience nor be used to dismiss what she actually experiences.

🌙 Reflective frameworks

Miranda Gray's Inner Seasons are included here as a reflective framework rather than established reproductive physiology.

The evidence doesn't establish that all women move through four predictable psychological or behavioural seasons corresponding to menstrual phases.

The useful question is therefore not:

"Which Inner Season am I supposed to be?"

but:

"Does this framework help me recognise anything meaningful about my own experience?"

🔎 What self-tracking can — and can't — tell us

Prospective observation can help identify whether something appears to repeat.

But tracking can show an association; it cannot by itself establish hormonal concentrations, biological mechanism, causation or diagnosis.

That means:

"I repeatedly feel exhausted around this point in my cycle."

can be valuable information.

It does not automatically establish:

"Progesterone causes my fatigue."

The experiment therefore treats:

Observation → Association → Possible explanation → Diagnosis

as different levels of inference.

An AI-generated explanation does not turn an association into medical evidence.

🌱 What this means for you

Population evidence and personal experience answer different questions.

A population study showing no average cognitive decline before menstruation doesn't mean you cannot repeatedly experience difficulty concentrating then.

It means we shouldn't assume every woman does.

Likewise, a small average metabolic or appetite effect doesn't mean it will be meaningful for you.

This is why Cycle Curiosity treats:

"I have no energy."

as the beginning of a question rather than the end of an explanation.

What do you mean by energy?

How did you sleep?

Are you in pain?

Are you hungry?

Are you physically tired, mentally depleted, sleepy, ill or overwhelmed?

Has it happened before?

What else was happening?

Your experience doesn't need to become a universal biological rule to be worth understanding.

References & Further Reading

The final publication reference list will prioritise:

• authoritative reproductive-health and clinical guidance;

• systematic reviews/meta-analyses on cognition, exercise, appetite, metabolism and sleep;

• prospective menstrual-cycle studies where appropriate;

• clinical guidance on PMS/PMDD and abnormal bleeding;

• authoritative menopause-transition guidance.

🌿 A Living Whole Life Synergy Experiment

This is a living resource.

The Cycle Curiosity Experiment is part of my developing Whole Life Synergy framework, and I'm intentionally sharing it while I continue to learn, research and test how useful this approach is in real life.

Future versions may include:

• clearer questions;

• improved AI instructions;

• additional scientific references;

• better adaptations for different life stages;

• insights from women actually using the experiment.

If you've copied the prompt previously, you can return to this page to see whether a newer version has been published.

You don't need to abandon an experiment that's already working for you simply because the prompt has changed.

💬 Help Me Grow the Experiment

If you try The Cycle Curiosity Experiment, I'd love to learn from your experience.

I'm particularly curious about:

• What did it help you notice?

• Did anything surprise you?

• Did any question change how you understood yourself?

• Did the AI make assumptions that didn't fit you?

• Was anything confusing or repetitive?

• Did anything feel overwhelming?

• Was there something important it never asked?

• Did you discover a connection you hadn't previously considered?

• Did you try a small change because of something you noticed?

• Was that change useful?

• What would make the experiment better?

You can share your experience in the comments below.

Please don't share private medical or personally identifying information in a public comment.

Your feedback may help shape the next version and make this resource more useful for other women.

🌿 One Last Thought

The menstrual cycle is often presented as something women should control, endure, fix or optimise.

I'd like to explore another possibility:

What if we first learned to understand it?

Not so that hormones dictate our calendars.

Not so that every difficult day needs a hormonal explanation.

Not so that we become better at extracting productivity from every phase.

But because understanding gives us context.

Context helps us recognise patterns.

Patterns help us ask better questions.

And better questions give us more informed choices about what we might need.

That is where this experiment begins.

Understand first.
Observe what is actually happening.
Connect what might belong together.
Stay curious about what you don't yet know.

And from there, gradually build what works for you.

🌱

The Cycle Curiosity Experiment is an educational Whole Life Synergy resource. It is not intended to diagnose, treat, cure or prevent any medical condition and does not replace personalised advice from an appropriately qualified healthcare professional.