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
Common questions
Why do I get insomnia before my period?
Real physiology, not imagination: sleep disruption is a documented core PMS symptom, per the Office on Women's Health. The mechanism: progesterone - which rises after ovulation and has genuinely sedating, sleep-promoting effects - falls sharply in the premenstrual days, taking that help away; body temperature runs higher in the luteal phase, and the nightly temperature drop that triggers sleep gets blunted; and the mood symptoms of PMS (anxiety, low mood, rumination) are sleep's enemies in their own right. The result: trouble falling asleep, more waking, and less refreshing sleep in the days before the bleed, lifting as the period starts. What helps: the sleep basics matter double that week - strict schedule, cool room (countering the temperature issue), no late alcohol (it fragments the sleep it pretends to help), and the wind-down routine; magnesium's premenstrual evidence is modest but it is low-risk. The line worth drawing: if the premenstrual week brings severe mood symptoms with the insomnia - hopelessness, rage, feeling unlike yourself - ask about PMDD (premenstrual dysphoric disorder), the treatable severe form. In crisis: 988 in the US, or your local crisis line. Pymander, a free AI doctor available 24/7 by text, can help you track the pattern.