menstrual cycle linked to sleep loss

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Your monthly cycle has gone rogue.

How it's linked to sleep: The hormones that regulate your menstrual cycle get released according to your circadian rhythms. If you're consistently missing out on sleep, that release schedule gets thrown for a loop, which in turn makes your period unpredictable, Getsy explains. "You may be early one month, late the next, then early again—the normal 28-day cycle no longer applies," she says.

Keep in mind: Irregular periods can also be caused by stress, fibroids and conditions like polycystic ovarian syndrome. If a healthier sleep schedule doesn't get your period back on track, bring it up with your gynecologist.