Can perimenopause cause insomnia?
Yes. Sleep disruption is one of the most common and earliest symptoms of perimenopause, driven by declining progesterone, fluctuating estradiol, night sweats, and shifts in cortisol rhythm. It frequently precedes the more recognized symptoms.
Full answer
Yes. Sleep disruption is one of the most common — and earliest — symptoms of perimenopause, and frequently appears years before cycles become noticeably irregular or hot flashes begin. The drivers are layered: progesterone, which has a calming, GABA-active metabolite (allopregnanolone), declines as ovulatory cycles diminish; estradiol fluctuates erratically, producing night sweats that fragment sleep; and the cortisol rhythm shifts in ways that make early-morning awakening more common. The combination produces difficulty falling asleep, frequent awakening, and unrefreshing sleep. Provider-reviewed BHRT — when appropriate — frequently improves sleep within weeks because it addresses the upstream hormonal driver rather than just the symptom. Sleep hygiene, alcohol moderation, and thyroid evaluation remain part of the picture.
Educational. Not a substitute for individualized provider review.
- Sleep Disturbance — Primary source · oMeds
- Perimenopause & menopause — Reference · oMeds Learn
- Reviewed by Dr. Laura Purdy, MD, MBA · Clinical Director, oMeds · Last reviewed 2026-05-29