Premenstrual syndrome (PMS) refers to a collection of symptoms, mood/emotional changes and sleep problems such as insomnia and day time sleepiness in the week or 2 leading up to menstruation. A recent study of 2 group of women (some of whom suffer from significant PMS and others with minimal PMS symptoms) in whom sleep and daytime alertness were monitored, found that women with significant PMS symptoms reported being sleepier and less alert during the days prior to menstruation. This suggests that menstrual sleep changes may be common in women regardless of if they experience PMS symptoms or not, and that day time sleepiness may occur independently of those changes.

J Sleep Res. 2007 Sep; 16(3): 262-8

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