Why do I get insomnia before my period?
Last updated September 3, 2026.
Real physiology: sleep disruption is a documented core PMS symptom, per OWH - progesterone (genuinely sedating) falls sharply premenstrually, body temperature runs higher and blunts the sleep-triggering nightly drop, and PMS mood symptoms attack sleep too. So: trouble falling asleep, more waking, less refreshing sleep in the days before the bleed, lifting as it starts. The basics matter double that week: strict schedule, cool room, no late alcohol, a wind-down. The line to draw: severe mood symptoms with the insomnia - hopelessness, rage, feeling unlike yourself - is the PMDD question: ask. In crisis: 988 in the US, or your local crisis line.
What to do
- Double down on schedule that week. Fixed wake time, cool dark room.
- Cut evening alcohol. It fragments the sleep it pretends to help.
- Track against the cycle. Two months of the pattern is diagnostic gold.
- Ask about PMDD if mood drops hard. Treatable; saying the name starts it. In crisis: 988.
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