Why Can't I Sleep Anymore? The Truth About Perimenopause and Insomnia
Written by Dr Shauna Watts, GP with special interest in perimenopause and menopause care.
You Haven't Forgotten How to Sleep
You used to be a good sleeper. Now you’re lying awake at 3am, mind racing, drenched in sweat, or waking for no apparent reason and unable to get back to sleep. You’re exhausted but you can’t rest.
Sleep disruption is one of the most common – and most debilitating – symptoms of perimenopause. And it’s not just about hot flushes waking you up, though that’s part of it. The hormonal changes of perimenopause affect sleep architecture itself.
Why Does Perimenopause Disrupt Sleep?
There are several mechanisms at play, often happening at the same time:
Falling Progesterone
Progesterone is the first hormone to decline in perimenopause, often years before oestrogen. It has a calming, sedative effect on the brain. When it drops, many women notice they start waking more easily, sleeping more lightly, and struggling to switch off at night.
Fluctuating Oestrogen
Oestrogen helps regulate your body temperature and your stress response. As it fluctuates, hot flushes and night sweats can wake you repeatedly – even if the flush itself is brief.
Cortisol Dysregulation
Perimenopause can shift the timing of your cortisol curve. Some women start waking at 3 or 4am with a racing mind and a sense of alertness that simply wasn’t there before. This is often cortisol rising earlier than it should.
Anxiety & Mood Changes
Sleep and mental health are bidirectionally linked. If perimenopause is driving anxiety or low mood – which is extremely common – those symptoms will also disrupt sleep.
"Poor sleep in perimenopause is almost never just poor sleep habits. There's usually a hormonal driver - and treating that driver is the most direct path to better sleep."
- Dr Shauna Watts -
How Much Sleep Disruption Is 'Normal'?
Some change in sleep is common during perimenopause. But if you’re waking multiple times per night, struggling to get back to sleep, feeling unrefreshed most mornings, or noticing your mood, memory, and concentration suffering as a result – that warrants attention. This is not something you simply have to put up with.
What Helps?
Menopausal Hormone Therapy (MHT)
For women whose sleep disruption is driven by hot flushes and night sweats, MHT is often the most effective intervention. Restoring oestrogen and progesterone levels can dramatically improve sleep quality — and progesterone in particular has a direct calming effect on the brain.
Sleep hygiene – but the right kind
The basics still matter: consistent wake time, cool dark room, limiting screens before bed, avoiding alcohol. But I want to be honest — if your sleep is being disrupted by hot flushes or cortisol dysregulation, sleep hygiene alone is unlikely to fix it. It’s an important layer, not the whole answer.
Cognitive Behavioural Therapy for Insomnia (CBT-I)
CBT-I is the gold standard psychological treatment for insomnia and has strong evidence behind it. It can be delivered digitally through apps like Sleepio. Worth considering alongside hormonal treatment, not instead of it.
Address the anxiety
If anxiety is driving your 3am wakenings, that needs its own attention — whether through MHT (which can improve mood), therapy, or other strategies. Don’t assume it’s separate from your perimenopause.
Limit alcohol
I know this isn’t what anyone wants to hear, but alcohol significantly disrupts sleep architecture and worsens hot flushes. Even one or two drinks can fragment your sleep in perimenopause in ways they simply didn’t before.
Frequently Asked Questions
Is waking at 3am a sign of perimenopause?
It can be. Early morning waking – particularly if accompanied by a racing mind or sense of alertness – is a recognised symptom of perimenopause, often linked to progesterone decline and changes in cortisol rhythm.
Will my sleep improve after menopause?
For many women, yes. Once hormones stabilise post-menopause, sleep often improves. But this isn’t guaranteed, and there’s no reason to wait it out for years when treatment is available.
Can I take sleeping tablets?
Short-term use of sleep aids may be appropriate in some situations, but they don’t address the underlying hormonal cause. I generally prefer to treat the root cause rather than layer another medication on top.
Does MHT really improve sleep?
Yes – particularly the progesterone component. Micronised progesterone (Prometrium or Utrogestan) has strong evidence for improving sleep quality and is often the most noticeable change women report in the early weeks of starting MHT.