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Progesterone is the female hormone that prepares the womb for pregnancy; it's also integral to inducing sleep. Low progesterone levels during the beginning of the menstrual cycle can interfere with deep sleep, but when ovulation starts, hormone levels rise, causing sleepiness during the day. As menstruation begins, levels of both progesterone and estrogen drop, potentially causing insomnia. If you suspect your sleep is being affected by your menstrual cycle, you might want to keep a sleep diary. A diary can help you determine when in your cycle you should make an extra effort to avoid caffeine, late afternoon or evening workouts, and other factors that could exacerbate the problem. But if you're experiencing severe insomnia or extreme fatigue during the day, talk to your health care provider.
* Source: Suzanne Frank, The Hearst Corporation