A recent Yougov x Pukka survey found 81% – 4 in 5 – perimenopausal women struggle with sleep – and while this is normal, it doesn’t mean it’s something you just need to ‘put up with’. In this special two part series, I’ll be sharing insights as to why this is happening – and what you can do about it, backed by science. Sleep isn’t a luxury – it’s a necessity, and a biological need for mental clarity, emotional resilience, sustained energy.. And more. So here – I’m sharing with you, without any bars held: why can’t perimenopausal women sleep?
First thing all perimenopausal women need to know… it’s not your fault, you are not to blame, and despite this being part of your natural biological shift, that doesn’t mean you’re doomed. Key drivers of your sleeplessness include:
ONE: Hormonal Shifts = Disrupted Sleep Architecture
You’re well aware, perimenopause comes with a sharp decline of estrogen and progesterone. What is less commonly known is how the loss of these hormones plays havoc on deep slow wave sleep, REM sleep and overall sleep architecture:
Declining estrogen means:
- You produce less melatonin, our master sleep hormone; meaning you’ll find it harder to fall asleep, stay asleep, and enter deep sleep; leaving you with light, unrefreshing sleep that is easily interrupted.
- As estrogen usually plays a role within melatonin production, the loss of one equals the loss of the other. Note that melatonin levels are already on the downward slope after the age of 30, declining by 0.5-1% each year, but in perimenopause, it’s even worse.
- Hot flashes – a category of their own, see below.
Declining progesterone means:
- Higher levels of anxiety – driving shallow, broken sleep, 3am wakings, difficulties returning to sleep when you do wake up.
- This is because progesterone usually supports our GABA system; our primary calming hormone. When GABA is at it’s peak, you feel calm, centered, relaxed. Your parasympathetic nervous system, (aka rest and digest) is more dominant, and you spend less time in your sympathetic state, (aka fight or flight). However, in perimenopause, progesterone declines. As a result, so do the effects of GABA, leaving you anxious, wired and unable to switch off.
TWO: Elevated cortisol drives 3am wakings
Cortisol, your stress hormone, is in overdrive in perimenopause, and it’s the key driver of those 3am wakings – as the circadian rhythm usually drives cortisol up around 3am to prepare you to be alert the next morning; if your baseline levels of cortisol are too high, you’ll wake up. Why may your cortisol levels be elevated?
- Lack of sleep in itself – can increase your levels by 37%, even just after 1 night
- Chronic lack of sleep dysgulates our HPA axis, the region to release cortisol, making it more reactive and responsive. Breaking down at the supermarket because you can’t find your favourite bread? Having a panic attack when you misplaced your keys? That’s your HPA axis – and cortisol – in overdrive.
- Loss of progesterone – remember, that usually supports GABA, our calming hormone to help us feel relaxed
- Lower levels of melatonin – usually plays a calming role in the body
THREE: Hot Flushes Hijack Melatonin
To produce melatonin, fall asleep and stay asleep, your core body temperature needs to drop by 1–2°C. All good and well until you’re drenched in sweat night after night, wide awake, stressed about returning to sleep.
Driven by fluctuating estrogen, these hot flashes don’t just wake you because you’re hot – they wake you because they impair melatonin, which then impairs sleep. As a result, you sleep lightly, wake frequently and feel exhausted – even after 8 hours.
It’s not just your body keeping you awake — it’s your brain, too.
For many women, the expectation that sleep will deteriorate in perimenopause becomes part of the problem. You’ve heard the horror stories, you’ve read the research — so even before the transition begins, you’re mentally preparing for things to go haywire. And that anxiety? It activates what sleep psychologists call pre-sleep rumination — mentally scanning for anything that might keep you up.
From there, it becomes a cycle:
• You start anticipating poor sleep.
• You focus more on every disruption — a creaky floorboard, a hot flush, a buzzing phone.
• You notice the disturbance, and your brain locks on: “See? I knew I wouldn’t sleep.”
Over time, this creates what’s known as conditioned arousal — where you begin to associate bedtime, your bedroom, or even the thought of sleep with anxiety. Your nervous system becomes primed for alertness instead of rest.
This mental busyness — constantly thinking, worrying, preparing — is called cognitive hyperarousal, and clinical evidence shows it’s one of the strongest behavioural predictors of chronic insomnia for perimenopausal women, even more so than hormones.
As you can see… even if you’re doing all the right things, come perimenopause, through no fault of your own, sleep will be lighter, broken, unrefreshing – that’s if you manage any at all. That said, this does not mean you are destined for sleeplessness throughout the transition – not you, not your sisters, not your girlfriends.
It’s just learning how to navigate this shift; and work with your hormones, rather than fight against them. In parts two and three of this series, i’ll be sharing all that and more – stay tuned so you can reclaim your sleep, sanity and thrive, even in perimenopause.
Written by Olivia Arezzolo – Australia’s Leading Sleep Expert and Keynote Speaker. With nine years of academics, 500+ media features, partnerships with The Westin, Samsung, Medibank and more, Olivia translates sleep science into actionable advice. These insights have been taken from Olivia’s keynote Perimenopause and Sleep: What Every Woman Needs to Know. For bookings for Q3/Q4 including World Menopause Day, email hello@thesleepretreat.com.au. To connect with Olivia directly, head to Instagram and LinkedIn – she’d love to hear from you.
