The gap is real and biological
Across more than 30 epidemiological studies, women report insomnia roughly 1.4x more often than men. The gap appears at puberty, widens during reproductive years, and peaks during perimenopause.
The menstrual cycle
Progesterone rises after ovulation and falls sharply before menstruation. The premenstrual drop disrupts sleep architecture for many women — sleep onset takes longer, deep sleep falls, and 3 a.m. waking becomes common in the days before bleeding.
Pregnancy
First trimester: progesterone surge causes daytime sleepiness but fragmented night sleep. Third trimester: physical discomfort, reflux, and frequent urination dominate. Side sleeping with a pregnancy pillow and elevating the head 30 degrees both help.
Perimenopause and menopause
Estrogen and progesterone decline causes hot flashes, night sweats, and anxiety-driven awakenings — usually starting in the early 40s. Hormone therapy, low-dose SSRIs, and cooling sleep systems all have strong evidence.
Stress load asymmetry
Beyond biology, women still carry disproportionate share of caregiving and household management — the 'mental load.' This shows up as bedtime rumination. Scheduled worry windows and partner workload audits help more than supplements.
What to try first
Track sleep alongside your cycle for two months — the pattern usually becomes obvious. Then layer interventions: cooling bedroom, magnesium glycinate in the luteal phase, CBT-I if symptoms are chronic, and a clinician visit for hormone evaluation in the 40s and 50s.
FAQ
Is melatonin safe in pregnancy? Evidence is limited — discuss with your OB before use. Does birth control affect sleep? Yes — some formulations improve sleep, others disrupt it. Track and discuss with your provider. When is hormone therapy appropriate? Often around perimenopause when symptoms impair quality of life; individualized with a clinician.