Sleep

Sleep often gets worse in perimenopause, and the most common pattern is not trouble falling asleep but waking in the second half of the night and struggling to get back to sleep. Night sweats, shifting estrogen and progesterone, and mood changes each raise the odds of broken sleep, and sleep apnea becomes more common after 40. The best-supported treatment is cognitive behavioral therapy for insomnia (CBT-I); hormone therapy helps when night sweats are the trigger.

Where to start

If your wake-ups cluster in the early hours, begin with why perimenopause wakes you at 3 AM, which explains why the second half of the night becomes fragile. For how common insomnia is at each stage and how the treatments rank, read perimenopause insomnia: causes and treatments. If you snore, wake unrefreshed or have morning headaches, read sleep apnea in women after 40 before assuming hormones are the whole story.

Causes and treatments at a glance

What is going on	Typical sign	What the evidence supports	Read the guide
Lighter, more fragile sleep late in the night	Waking around 3 or 4 AM and lying awake	CBT-I; treating night sweats if they are the trigger	Why perimenopause wakes you at 3 AM
Chronic insomnia	Trouble falling or staying asleep for weeks, with tired, foggy days	CBT-I, the only strongly recommended insomnia treatment	CBT-I for menopause insomnia
Night sweats	Waking hot, damp or with a racing heart	Hormone therapy, or an evidence-based nonhormone option	Hormone therapy and sleep
Sleep apnea	Unrefreshing sleep, morning headaches, fatigue, not always loud snoring	A sleep study; questionnaires cannot rule it out	Sleep apnea in women after 40
Reaching for melatonin	Hoping a supplement will keep you asleep	Not recommended for chronic insomnia; better suited to timing problems such as jet lag	Melatonin in perimenopause

What the evidence says

CBT-I is a short, structured program, typically about six sessions, that retrains sleep through sleep restriction, stimulus control and work on the clock-watching and worry that keep you alert. In a MsFLASH trial of perimenopausal and postmenopausal women who all had hot flashes, six telephone sessions put 70% of participants in the no-insomnia range at 8 weeks. The American Academy of Sleep Medicine advises against relying on sleep hygiene alone, and suggests against melatonin, diphenhydramine and valerian for chronic insomnia because trials show little benefit.

Hormone therapy works on sleep mainly by stopping night sweats, so it helps most when hot flashes are part of the picture. If they are, the night sweats guide covers the hormonal and nonhormonal options side by side.

When to see a clinician

Make an appointment if poor sleep has lasted more than a few weeks and is affecting your days. Go sooner if you snore loudly or wake gasping, fall asleep unintentionally during the day, have low mood or anxiety that is hard to control, or have night sweats with fever or unexplained weight loss. If you have thoughts of harming yourself, call or text 988.

A two-week sleep diary shows your own pattern before the visit, and the symptom check helps you describe the rest of what is going on. A sleep medicine specialist can test for sleep apnea and arrange CBT-I, and the directory lists other clinicians who treat the transition.