You fall asleep fine. Then at 3am you are suddenly awake, heart a little fast, mind already running through tomorrow. An hour later you are still there, watching the ceiling, doing the maths on how little sleep you will get if you drop off right now.
If this started in your forties and keeps happening, perimenopause is one of the explanations worth considering. Sleep problems are among the most common complaints of the menopause transition. They are also one of the least specific, because a lot of other things that cause bad sleep become more likely at the same age.
This piece covers why the transition disrupts sleep, the other causes that need ruling out, the treatment with the strongest evidence, and how to work out which kind of bad night you are actually having.
It is general information, not medical advice. Persistent insomnia deserves a conversation with a clinician who knows your history.
How Common It Is
The Study of Women's Health Across the Nation (SWAN), which has followed thousands of women in the United States through midlife since the 1990s, found that reported sleep difficulty rises as women move from the premenopausal years into perimenopause, and stays higher afterwards for many.
The typical pattern is not trouble falling asleep. It is **waking during the night and not getting back to sleep**, often in the early hours.
Why Perimenopause Disrupts Sleep
There is rarely a single cause. Several things change at once.
Night sweats
The obvious one. A night sweat can wake you fully, or it can pull you up into lighter sleep without you remembering the heat at all. You just notice you are awake, and maybe that the duvet is off. If you have not yet read it, the guide to hot flashes and night sweats covers triggers and treatments in detail.
Falling progesterone
Progesterone is broken down in the body into allopregnanolone, a compound that acts on the same calming GABA receptors targeted by many sleep medications. In perimenopause, ovulation becomes less regular and progesterone tends to fall earlier than oestrogen. Some researchers think losing that gentle sedative effect is part of why sleep gets lighter, even on nights without sweats.
Mood and anxiety
Anxiety and low mood both disrupt sleep, and both become more common during the transition. The relationship runs both ways: poor sleep makes mood worse, and a worse mood makes the next night harder. The piece on perimenopause anxiety goes into that link.
Needing the toilet
Changes to the bladder and pelvic floor tissue around menopause can increase how often you wake to urinate. Each trip is another chance to wake fully.
The Other Causes to Rule Out
This is the part that often gets skipped. Midlife is also when several sleep disorders become more common, and they need different treatment.
| Cause | Clues that point to it |
|---|---|
| Sleep apnoea | Loud snoring, gasping or pauses noticed by a partner, morning headaches, heavy daytime sleepiness |
| Restless legs | An urge to move the legs in the evening or at night, eased by moving |
| Thyroid problems | Weight change, feeling hot or cold, palpitations, hair or skin changes |
| Medication effects | Symptoms that started with a new medicine or dose |
| Alcohol | Waking a few hours after drinking, even a small amount |
Sleep apnoea deserves a special mention. Large cohort studies, including the Wisconsin Sleep Cohort, found that sleep disordered breathing is more common in women after menopause than before, independent of age and weight. Progesterone appears to support breathing drive, which may be part of the reason. In women it often shows up as fatigue, insomnia or morning headaches rather than the dramatic snoring people expect, so it gets missed.
If you wake unrefreshed after what should have been enough hours, mention it.
What Has the Best Evidence
CBT for insomnia (CBT-I)
Cognitive behavioural therapy for insomnia is the recommended first treatment for chronic insomnia in adults, ahead of sleeping pills, in guidance from bodies including the American College of Physicians. It is a structured programme, usually six to eight sessions, delivered in person, by phone or through validated digital programmes.
It works on the habits and thought patterns that keep insomnia going once it has started:
- Sleep restriction: temporarily limiting time in bed to the time you actually sleep, then extending it as sleep consolidates. It is hard for a week or two and it is the most powerful part
- Stimulus control: getting up if you have been awake for a while, so the bed stops being associated with lying awake
- Working on the 3am thoughts: the catastrophising about how tired you will be tomorrow, which is often what keeps you awake
Importantly for this age group, the MsFLASH trial, published in 2016, tested CBT-I in women in midlife who also had hot flashes. Insomnia severity improved meaningfully, and the benefit held at follow up. Hot flashes do not make CBT-I useless.
Treating the flashes
If night sweats are clearly the main thing waking you, treating them often improves sleep as a side effect. Hormone therapy is the most effective treatment for flashes. Some people are prescribed micronised progesterone as part of their HRT and notice it helps them sleep, likely because of the sedating effect described above. Non hormonal options for flashes exist too. The HRT guide explains the options and how long they take to work.
Basic sleep habits
On their own, sleep hygiene tips rarely fix established insomnia. They are still worth getting right, because they remove obstacles:
- A cooler bedroom and lighter bedding, which helps with sweats too
- Alcohol earlier in the evening or not at all, since it fragments the second half of the night
- Caffeine finished by early afternoon
- A consistent wake time, even after a bad night. This matters more than a consistent bedtime
Work Out Which Bad Night You Are Having
"I sleep badly" is hard for anyone to act on. "I wake two or three times a week around 3am, usually soaked, and mostly in the week before a period" is much easier.
For two to four weeks, note each morning:
- Roughly when you woke and how long you were awake
- What woke you, if you know: heat, sweat, toilet, a noise, racing thoughts, nothing obvious
- Anything relevant from the evening: alcohol, a late meal, stress
- Where you are in your cycle, if you still have one
Patterns that point in different directions:
- Waking soaked or hot most nights: night sweats are the main target
- Waking with racing thoughts and no heat: anxiety and CBT-I are the main target
- Waking unrefreshed despite enough hours, with snoring: ask about sleep apnoea
- Worse in the days before a period: hormone fluctuation is likely playing a part
Where Alva Fits
Alva is a perimenopause tracker for iPhone built around exactly this kind of pattern finding.
You can log night sweats alongside the other 40 symptoms it covers, including mood shifts and brain fog, against a cycle log that handles irregular cycles without predicting dates that will not arrive. If you are on hormone therapy, it keeps your dose history and adherence, which makes it easier to see whether sleep changed after starting or adjusting a regimen. One tap exports three months of entries as a clinical PDF to take to an appointment.
What it is not:
- It is not a sleep tracker. It does not measure sleep stages or breathing. If you want bedtimes and wake times, keep a simple sleep diary alongside it
- It cannot diagnose sleep apnoea or any other condition. Only a proper sleep assessment can do that
- It is not a medical device and does not give medical advice
The Short Version
- Sleep problems become more common during perimenopause, usually as waking in the night rather than trouble falling asleep
- Night sweats, falling progesterone, mood changes and bladder changes all contribute
- Sleep apnoea, restless legs, thyroid problems, medicines and alcohol can all cause the same complaint and need ruling out
- CBT-I is the recommended first treatment for chronic insomnia, and it works in midlife women with hot flashes too
- If sweats are the main cause, treating them often improves sleep
- A few weeks of noting what woke you turns "I sleep badly" into something a clinician can act on