Why Your Body Clock Matters

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Circadian rhythm and hormones. Why your body clock sets the stage for every hormone you make. This week I want to talk to you about your body clock and why it matters so much for your hormones during perimenopause. Most of us have lost touch with our own natural rhythms. We know our children's needs, our partner's needs, even our dogs' needs better than we know what our own body is asking for sometimes. One of the clearest ways we have lost that connection is in how we treat our circadian rhythm.

Light And Darkness Deficiency

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Each of us now lives with a darkness deficiency that affects our melatonin and our sleep, and a lightness deficiency because we do not go outside often enough to receive the light of sunshine. So melatonin is your sleep hormone and it is activated in the dark. And cortisol is your stress response, but in fact, in this instance, cortisol is a really good thing. We need something called the cortisol awakening response in order to jump out of bed and feel like we're ready to start the day in a really good energetic way. We spend our days indoors under fluorescent lighting, screens and zoom calls, and our nights lit up when our body is expecting darkness. I so often tell the women in my clinic to please try to mimic outside light. So as the sun's setting, if you possibly can, purchase some lamps, even if they're really inexpensive, with really light light, with really dim light at night, so that you know your house isn't lit up like a Christmas tree. I remember one of my patients telling me once upon a time when I'd explained this darkness deficiency to her, she was like, Oh my god, no wonder my kids can't sleep. My house is lit up like a Christmas tree at night. So please try to dim the lights and um and keep things as dark as absolutely possible.

Cortisol And Melatonin Explained

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Your circadian rhythm is roughly a 24-hour internal clock that tells your body when to be alert and when to rest. It is run by light and darkness and it sets the timing of two hormones that shape how you feel every single day. So cortisol and melatonin. Sometimes I actually think that cortisol and melatonin are even more important than, look, obviously all of our hormones are important, but to get cortisol and melatonin balanced is sometimes even more important than estrogen and progesterone. And they get left out of the conversation far too often. In a healthy rhythm, your cortisol is highest in the morning, which is what wakes you up and gets you moving, and it tapers down through the day so that by nighttime it is low and melatonin can rise to bring on sleep. So what's important to know is that when cortisol is high, melatonin is low, and when melatonin is high, cortisol is low.

Night Cortisol And Metabolic Fallout

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So this is really important for a couple of things, and this is quite often when I say to women, we've got to sleep ourselves skinny. When our melatonin is um high at night, that's a good thing because that's our sleep hormone. When cortisol is high at night, cortisol spikes blood glucose, and blood glucose can spike insulin. So if our stress hormone is high at night, we're going to hold on to weight that we don't want to because our blood glucose is high, and this can set us up for type 2 diabetes, insulin resistance, metabolic syndrome, etc. So, in a healthy rhythm, your cortisol is highest in the morning, which is what wakes you up and gets you moving, and it tapers down through the day so that by night it is low and melatonin can rise to bring on sleep. This is also why it's not very helpful to take a cortisol blood drawer somewhere in the morning when you go and get your blood tested. It's far more helpful to see what your diurnal cortisol is doing. So, for example, with the Dutch test, they measure cortisol four times throughout the day. And that's much better so that we can actually see what cortisol is doing throughout the day rather just receiving basically a photograph of the ocean and expecting to understand the entire tide. Cortisol works the same way. It's important for us to see what it's doing throughout the day as opposed to just getting one reading at a moment in time. When this rhythm between cortisol and melatonin is working, you wake feeling refreshed and you sleep deeply. When it is inverted, you get the opposite. Low cortisol in the morning, so you wake exhausted and flat, and high cortisol at night, so you lie there wired and tired, unable to sleep even though you are absolutely exhausted. In

Perimenopause Sleep Changes Are Real

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perimenopause, this becomes harder to hold together and it is not your imagination. Sleep architecture genuinely changes during this phase, with around 61% of women experiencing significant disruption. Progesterone, which begins to decline years before estrogen does, is one of the main reasons. Progesterone is a neurosteroid that promotes GABA activity in your brain, and GABA is what allows deep restorative sleep. As progesterone declines, that support for sleep weakens. At the same time, low melatonin and a disrupted cortisol pattern can explain exactly why you're waking at 3 a.m. and cannot get back to sleep despite feeling exhausted. This is the repair work of the hierarchy of healing, because until your rhythm and your sleep are restored, your hormones do not have a stable foundation to rebalance on. Here is what I want you to understand. Your body clock is not a lifestyle luxury, it is a hormonal control system. When we restore your circadian rhythm, when your cortisol peaks in the morning and falls away by night so melatonin can do its work, your sleep improves, your energy comes back, and your hormones have a steady base they need. I have watched this happen in my clinic many times and it is a foundation, and everything else in your healing rests on this exactly. I want to begin with something simple that I hear almost every week in the clinic. A woman tells me she's exhausted all day and then the moment her head hits the pillow, her mind switches on and she cannot sleep. Or she falls asleep easily enough and then wakes at 3 a.m. wide awake staring at the ceiling. If that is you, I want you to know that this is not a personal failing and it is not you doing something wrong. It is your body clock and your body clock can be understood and restored. Today I'm going to explain what your circadian rhythm actually is, how it controls cortisol and melatonin, and why perimenopause makes it harder to keep in rhythm and what you can begin to do about it this week. Let me begin with what you're experiencing because I want you to feel recognized before we get into the biology. You wake tired even after a full night in bed. You feel flat and unmotivated in the morning, and then somehow more awake at 10 p.m. than you were all day. You wake in the small hours and cannot get back to sleep. Night sweats break into your sleep and pull you out of the deep stages. None of this means your body is failing. It means your body clock has been thrown out of rhythm and your hormones are following it. Understanding the biology. Now let me explain the biology because once you understand it, it stops feeling really random. Your circadian rhythm is your internal 24 hour clock, and it is set by light and darkness. It controls the daily timing of two hormones. The first is cortisol, your main stress hormone, which should be highest in the morning. That morning rise is called the cortisol awakening response, and it is your body's natural alarm clock. The rising cortisol is the first 30 to 60 minutes after you wake that moves you from sleep into alertness. The second is melatonin, your sleep hormone, which should rise at night as the light fades to bring on sleep. In a healthy rhythm, these two work in opposite directions across the day. Cortisol is high in the morning and low at night, or it should be, and melatonin is low in the daytime and high at night. That opposition is what gives you energy when you want it and sleep when you need it. When you're camping under the stars away from screens, your body naturally falls asleep at sundown and wakes with the sunrise because it is following light and darkness the way it was designed to. Connecting symptoms and root causes. So let me connect your symptoms to what is actually happening. When your cortisol is too low in the morning, you wake feeling tired, flat and unmotivated. When your cortisol is too high at night, you feel wired but tired, unable to fall asleep even though you are exhausted. That is an inverted circadian rhythm. Your body clock flipped the wrong way around. And when your melatonin is low, that can explain why you are waking at 3 a.m. or struggling to sleep despite feeling absolutely shattered. Perimenopause makes all of this harder, and there are real reasons for it. Progesterone declines years before estrogen does, and progesterone is a neurosteroid that promotes GABA activity in your brain to create deep, restorative sleep. GABA chills us out. As progesterone falls, that support for sleep weakens. Estrogen is fluctuating erratically at the same time, and night sweats break into your sleep and pull you out of the deep stages you need. This is why sleep architecture changes so much in perimenopause, with around 61% of women experiencing significant disruption. It is not in your head. Introducing the healing framework. This is

Repair First And Better Testing

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repair work, the first phase of the hierarchy of healing. I do not try to rebalance a woman's hormones while her sleep is broken and her body clock is inverted because there is no stable foundation to build on. We restore the rhythm first. In my clinic, I look closely at the cortisol awakening response and the dional cortisol pattern in relation to melatonin because these stress and sleep hormones directly affect how you feel, how you sleep, and how your body responds to perimenopause. I use the Dutch test alongside foundational blood tests for this because it tells me the story of how your hormones move across a full 24-hour period rather than at a single point in time, and it shows both your cortisol pattern and how well you're producing melatonin.

Cecilia And Restoring The Dawn Effect

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I want to tell you about a woman I call Cecilia. She came to me exhausted, especially on waking, and we confirmed she had an inverted circadian rhythm, low morning cortisol and high nighttime cortisol. Over nine months we repaired her gut, brought more progesterone on board, and restored balance to her cortisol. Her rhythm came back. She began to experience a healthy dawn effect, where her cortisol was highest in the morning, so she woke alert, no longer smashed, and lowest at night so she could sleep deeply. Restoring that dawn effect is one of the most powerful things you can do to feel like yourself again. Taking control and practical steps.

Simple Steps To Start This Week

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Here is what you can do this week, and none of it requires anything you do not already have. Get outside into natural light within the first hour of waking because morning light is what sets your cortisol rhythm for the day. So take your kappa out onto the porch and enjoy. In the evening, dim the lights and reduce the screens as the sun goes down so your body can produce the melatonin it needs. Keep your mornings and your bedtimes at consistent times because your body clock loves regularity. Alcohol is not your friend in perimenopause and disrupts the deep restorative stages of sleep that are already compromised by declining progesterone. So notice what it does to your nights and begin to track your own pattern because your body is giving you information every single day. When you want to track your sleep and energy, use the perimenopausal symptom tracker inside the Vitality Clinic and the Lifestyle, Food, Mood and Pain Diaries. You are in control of this. Your body clock can be restored, and when it is, everything else in your healing has a steady foundation. So let me bring all of this together for you. Your circadian rhythm is your body clock, set by light and darkness, and it controls cortisol in the morning and melatonin at night. In perimenopause, declining progesterone, erratic estrogen, and night sweats disrupt it, which is why you wake exhausted or wake at 3 a.m. This is the repair work and we restore the rhythm first so your hormones have a beautiful, stable foundation. The most powerful place to begin is morning light and an evening wind down and a consistent sleep and wake time. I

Reflection Questions And Tracking

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have some powerful reflection questions for you now. When during the day do you feel most awake and when do you feel most tired? What does your body do at night? Do you struggle to fall asleep or do you wake in the small hours? How much natural light do your eyes actually receive in the first hour after you wake? What does your evening look like in the hours before bed? If you wake at 3 a.m., what is usually going through your mind? How consistent are your sleep and wake times across a week? What have you been told about your sleep by a doctor? And did it match what your body was telling you? What is one thing about your evenings that is within your power to change? How do you feel about the idea of your tiredness having a physiological cause that you can address? What would it mean for the rest of your life if you woke up genuinely rested? I've got some practical implementation tips for you now. Get outside into natural daylight within the first hour of waking, ideally for 10 to 20 minutes, and set your cortisol rhythm for the day. As the sun goes down, dim the lights in your home and reduce screens so that your body can begin producing melatonin. I often say to my patients, working between 6 a.m. and 6 p.m. should be more than enough. Keep your wake time and your bedtime consistent, even at weekends, because your body clock responds to regularity. Notice what alcohol does to your sleep because it disrupts the deep restorative stages already reduced by declining progesterone. Track your sleep, energy, and mood using the perimenopausal symptom tracker inside the Vitality Clinic, alongside your lifestyle, food, mood, and pain diaries. If your pattern points to a cortisol or melatonin problem, note it so that you can discuss proper testing such as the Dutch test with your practitioner.

Clinical Insights And Key Takeaways

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Some clinical insights for you. The single most useful question I ask a tired perimenopausal woman is not how long she sleeps, but when she feels most and least alert across the day. The shape of that answer tells me whether her cortisol rhythm is inverted before any test comes back. Waking at 3 a.m. is one of the most common presentations I see. Generally women wake anywhere between 1 and 3 a.m. And it's frequently a melatonin and cortisol timing problem rather than a purely hormonal one. Low melatonin and a disturbed dional cortisol pattern explain it far more often than most women have actually been told. And if it isn't cortisol, melatonin and hormones, it's generally blood sugar dysregulation. So that's what we deal with in reclaim. I do not attempt to rebalance hormones while a woman's sleep is broken and her rhythm is inverted. Repair comes first. Restoring the dawn effect, cortisol high in the morning and low at night, is one of the highest leverage interventions available in perimenopause. Progesterone's decline is underappreciated as a sleep issue because progesterone promotes GABA activity for deep sleep. Its loss shows up as disturbed sleep long before a woman connects it to her hormones. The Dutch test earns its place here because it shows the cortisol awakening response, the full diurnal cortisol pattern, and melatonin production across 24 hours, which a single blood drawer cannot capture.