Why sleep falls apart in perimenopause, and what helps

Start with the big picture: how common broken sleep is in the transition, and why it so often has more than one cause.

Disturbed sleep affects 40 to 60% of women at this age#

Broken nights are a very common part of these years, and they tend to build as you go: the odds of trouble falling and staying asleep rise as the transition progresses.⁸

A review of the research puts sleep disturbance among the most bothersome symptoms of the transition, reported by 40 to 60% of women. In one large telephone survey, 26% of women in perimenopause met the criteria for an insomnia disorder, and difficulty staying asleep was the most common complaint.¹

The SWAN study followed more than 3,000 women through the transition for seven years. The odds of difficulty falling asleep and staying asleep increased stage by stage, and falling estradiol and rising FSH levels went with more trouble sleeping.⁸

Flushes, hormones and a busy mind stack up at night#

The causes tend to arrive together: hot flushes and night sweats, shifting hormones, and a mind that is more alert and worried at night. Each one makes the others harder to sleep through.

Hot flushes and night sweats are a key part of the picture: they affect up to 80% of women during the transition, and women with more frequent ones report more of every kind of sleep difficulty.¹⁸

They are not the whole story. Rumination, anxiety and feeling "switched on" at night, the classic features of insomnia, overlap with the menopause-specific causes.¹ That is useful: some of what keeps you awake can be changed directly.

About seven in ten hot flushes come with a waking#

Night sweats really do wake you, and the sleep laboratory shows how much: in women in perimenopause, hot flushes accounted for roughly a quarter of the time spent awake at night.²

In a sleep laboratory, 34 women in perimenopause had 3.5 hot flushes a night on average, 69% of them were linked to an awakening, and the waking they caused added up to about 17 minutes a night, 27% of all the time spent awake.²

Frequent hot flushes and night sweats lasted 7.4 years at the median in the largest study of their duration.⁹ That is a long time to wait for sleep to sort itself out, and a good reason to treat it now.

Night sweats explain much of the waking, but not always why you stay awake once you are up.

This part looks at what keeps the night going once you are awake: a busy mind, low mood, an evening drink and the room you sleep in.

Night waking is common, and worry keeps it going#

The waking often has two parts: a night sweat or alcohol wearing off starts it, and a busy, worried mind is what keeps you awake afterwards.

Night-time awakenings are the complaint women report most often in the transition.¹ In SWAN, waking earlier than planned was one of the three sleep problems tracked, and more frequent hot flushes went with more of each of them.⁸

Once you are awake, the clock and the to-do list take over. Getting up when you cannot sleep, rather than lying there trying, is one of the single techniques the sleep-medicine guideline suggests.⁵

• Wide awake at 3 a.m. every night
• I wake up drenched
• My mind starts racing as soon as I wake
• I fall asleep fine but cannot stay asleep
• Throwing the covers off and pulling them back on
• Exhausted but wired at night
• I used to sleep like a log

Poor sleep and low mood feed each other#

The link runs in both directions: the transition makes low mood more likely, and insomnia raises the chance of depression later on.¹⁰¹²

Among women with no history of depression, high scores for depressive symptoms were more than four times as likely during the transition as before it.¹⁰ Anxiety rises in the same years.¹¹

A meta-analysis of 21 long-term studies found that people with insomnia were about twice as likely to develop depression later as people without sleep difficulties.¹² Treating sleep is part of looking after your mood, and low mood itself deserves its own conversation with your doctor.

An evening glass helps at first, then disturbs sleep#

Wine helps you drop off but disturbs the second half of the night, which is exactly when sleep in perimenopause is already at its most fragile.³

A review of the laboratory studies found that alcohol, at every dose, helps you fall asleep and consolidates the first half of the night, then disrupts the second half. It also delays dream (REM) sleep.³

Whether alcohol also sets off your hot flushes is less clear. The 2023 position statement on non-hormonal treatments judged the evidence too limited to recommend avoiding triggers as a treatment for hot flushes.¹³ Your own notes are the better guide.

Keep the bedroom cool, whatever the exact number#

Heat in bed costs you sleep, so a cool, airy room with bedding you can adjust is the sensible default, even though no single temperature has been proven.⁴

In real-life conditions, with bedding and nightclothes, heat exposure increases wakefulness and reduces slow-wave and REM sleep, and humid heat adds to the load.⁴

Be realistic about what cooling can do. Cooling techniques have not been shown to reduce the number of hot flushes, and the 2023 statement does not recommend them as a treatment for flushes.¹³ A cool room is about sleeping through what flushes you do have, not about stopping them.

Habits like these help at the edges. The strongest evidence lies with a treatment that works on insomnia itself.

Seeing what breaks your nights is the first half. What follows covers the treatments worth discussing with your doctor, and four steps you can take tonight.

CBT-I is the first-line treatment, hot flushes or not#

Cognitive behavioural therapy for insomnia, a structured programme over a few weeks, is where treatment for chronic insomnia starts.⁵ A trial showed that it works for women in the transition who also have hot flushes.⁶

The American Academy of Sleep Medicine strongly recommends multicomponent CBT-I for chronic insomnia in adults, and advises against relying on sleep hygiene tips alone.⁵ CBT-I is considered the primary treatment for chronic insomnia and does better than sleep medication alone in the long term.¹

In the MsFLASH trial, 106 women aged 40 to 65 with insomnia and at least two hot flushes a day had six telephone sessions of CBT-I or of menopause education. Six months later, 84% of the CBT-I group no longer scored in the insomnia range, against 43% of the education group. The number of hot flushes did not change, but they interfered less with daily life.⁶

Hormone therapy and menopause CBT are worth discussing#

Hormone therapy is the most effective treatment for night sweats and tends to improve sleep when they are the cause.¹⁴¹ Menopause-specific CBT, recommended for night-time waking linked to hot flushes, is also worth raising with your doctor.¹⁵

Hormone therapy remains the most effective treatment for hot flushes and night sweats, and for healthy women under 60 or within ten years of menopause the balance of benefit and risk is favourable.¹⁴ It improves how women rate their sleep, particularly when hot flushes are present.¹ The type, dose and route are a decision for you and your gynaecologist.

The UK national guideline advises considering menopause-specific CBT for sleep problems such as night-time waking that come with hot flushes, alongside other treatments or instead of them.¹⁵ In a trial of 140 women, group or self-help CBT made hot flushes and night sweats less of a problem and reduced how often night sweats happened, with the benefit still present at six months.¹⁶

For women who cannot or prefer not to take hormones, several non-hormonal prescription options also have good evidence.¹³

Four free steps you can start tonight#

A fixed wake-up time, a cool bedroom, an honest test of what alcohol does to your nights, and getting up when sleep will not come all build on the core of CBT-I, and none of them costs anything.

These steps suit most women, but some sleep problems point to something else and should go to a doctor first.

This last part covers the warning signs to take seriously, and where our work sits alongside medical care.

Snoring, gasping or daytime sleepiness need a check#

Sleep apnoea becomes more common through the menopause, and in women it often shows up as insomnia.⁷¹ Loud snoring, gasping, pauses in breathing or strong daytime sleepiness are the signs to take to a doctor.

In the Wisconsin Sleep Cohort, postmenopausal women were 2.6 times as likely as premenopausal women to have sleep-disordered breathing, after accounting for age and body size, and the authors advise checking for it in women with snoring, daytime sleepiness or unsatisfying sleep.⁷ A later study with repeated home recordings found breathing pauses became more frequent as women moved through the transition, independent of ageing and weight.¹⁷

Women with sleep apnoea are more likely than men to describe it as insomnia.¹ The same research group concluded that sleep problems in midlife should not be put down to the menopause before other sleep disorders have been ruled out.¹⁸ Restless legs are another cause worth mentioning to your doctor.¹

We work on the habits around your nights, beside your doctor#

Sleep timing, evening habits, nutrition, movement and stress all shape how the transition feels at night. They are what we work on with you, alongside your medical care and never in place of it.

Your doctor can treat night sweats, rule out sleep apnoea and refer you for CBT-I. A short appointment rarely covers everything around the night: when you eat and drink, your daylight and movement, the stress you carry into the evening, and what your sleep looks like over weeks rather than one bad night.

That is the work of our programmes: a plan built on your own patterns, coordinated with your doctor when treatment is needed. If you are not sure where to start, talk it through with our care team on a free call.