Why Tired Women Can't Sleep

Sleep. The one thing everyone tells you to prioritise. The one thing that somehow became a luxury. If you're reading this at 11:47pm with one eye open while your brain rehearses tomorrow's 9am meeting….. settle in.

Most of the women I work with get terrible if not horrific sleep. Women often struggle with sleep because their nervous system is in over drive, alcohol disrupts REM, perimenopause and menopause have huge sleep implications and stress leads to rumination on a level that surpasses most base levels of stress.

The Cortisol Confusion

Cortisol gets a bad rap on all platforms. In burnout circles it's basically become the villain of the story however it's actually an essential, brilliantly designed hormone. It's your body's built-in energy deployer. It should ultimately peak in the morning as you wake and taper down through the day, reaching its lowest point at night so melatonin can take over and do its thing.

The problem? Chronic stress flips that curve. Your cortisol rhythm gets dysregulated and it stays elevated when it shouldn't, crashes when you need it and generally wreaks chaos in ways that land squarely at 2am when you're wide awake with a very strong opinion about usually a fairly trivial fact or replaying a conversation or an unanswered text.

A 2021 study published in the US stated that cortisol dysregulation, particularly elevated evening cortisol is strongly associated with sleep onset problems and frequent nocturnal waking. Not just stress or anxiety. The actual hormonal architecture of burnout, disrupting your sleep architecture.

What's Actually Happening in Your Brain While You Try to Sleep

Andrew Huberman (neuroscientist, Stanford Uni professor and basically the person I'd invite to every dinner party if I was able) describes sleep as a neurological non-negotiable. It should not be a choice or a negotiation and not a productivity hack but it is a fundamental biological process without which every other system degrades.

During sleep your brain runs what's essentially a cleaning cycle. The glymphatic system which is a waste clearance network that only fully activates during sleep, flushes out metabolic by-products including beta-amyloid (the protein associated with Alzheimer's disease). During the day, doing normal busy human things, that waste builds up. At night, your brain shrinks slightly to create channels for cerebrospinal fluid to rinse through.

You miss that window consistently? The waste accumulates. Cognitive fog, emotional dysregulation, reactive stress response, impaired decision-making which are all real, documented consequences of chronic sleep deprivation. Actually impaired, at a neurological level. READ THAT AGAIN.

Research from the University of California, Berkeley (Mathew Walker's lab) found that even one night of sleep deprivation produces a 60% increase in amygdala reactivity, meaning your threat-detection system becomes dramatically more sensitive the day after poor sleep. Your fuse gets shorter and things that normally roll off you land like grenades.

Perimenopause

So then we add the hormonal piece to the equation – perimenopause, menopause and sleep. If you're in your late 30s, 40s or early 50s suddenly your sleep deteriorates even worse than you managing a newborn……

Declining oestrogen affects the brain's thermoregulatory centre. That's why night sweats and hot flushes are not just annoying, they are neurologically mediated sleep disruptors. Progesterone, which has a natural sedative-like quality (it enhances GABA receptors - the brain's calm-down system), also drops in perimenopause. Less progesterone means less neurological braking on an already overactivated stress system.

Multiple international studies continue to report that perimenopausal women report significantly higher rates of sleep disturbance, insomnia and daytime fatigue compared to pre-menopausal women (independent of other health factors).

Hormonal biology changes in mid life women leads to a complete reorganisation of your sleep architecture with zero advance notice. FFS…..as if we didn’t have enough going on.

Source: Menopause: The Journal of The Menopause Society — Sleep disturbance in perimenopausal women.

Then There is Alcohol

A lot of women tell me they use a drink or two to wind down before bed. And look, in the moment it absolutely feels like it works as alcohol is a GABA agonist as it mimics the brain's calming signals and you feel drowsy faster.

However what actually happens is that alcohol suppresses REM sleep which is the stage where emotional processing, memory consolidation and hormonal regulation occur. Your total sleep time might look “fine” however the quality is significantly compromised. You're getting the sedation without any restoration. Then alcohol is metabolised mid-sleep and cortisol spikes as your liver processes it and leads you to wake at 3am feeling inexplicably anxious.

So, if you're using a drink to get to sleep regularly, that pattern is worth looking at…seriously.

What Actually Helps (That Isn't Just 'Go to Bed Earlier')

Huberman's research on circadian biology is genuinely useful here. Your body clock is largely regulated by light and specifically morning light exposure, which anchors your cortisol peak at the right time of day and sets up the melatonin drop correctly about 12-16 hours later.

• Get outside within 30-60 minutes of waking. Even on cloudy days. This is not optional small talk… it is the single most evidence-backed free intervention for circadian rhythm regulation.

• Dim your environment after dark. Blue-spectrum light suppresses melatonin production. If your house is lit like a stadium at 9pm, your brain doesn't know it's night.

• Cool your sleeping environment. Core body temperature needs to drop 1-3°C to initiate and maintain sleep. A cooler room is a physiological requirement.

• Address the nervous system and not just the sleep. If your cortisol is dysregulated because you're running on stress, no amount of lavender on your pillow fixes the root mechanism. The bedtime routine is downstream of what's happening during the day.

• Watch the evening alcohol. Or at least understand the trade-off you're making.

Sleep is the biological infrastructure everything else runs on. When it goes sideways and in midlife, during burnout, during perimenopause, it frequently does…. actually it usually does. The answer is to understand the mechanism and work with it.

None of us got the manual. But now you've got a bit more of the science.

Mez