Ladies in close proximity all get their periods at once, right? A full 95 percent of women say they believe in such "

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"Still, anecdotally, we see this all the time," says Alyssa Dweck, M.D., who points out that women who cohabit often have similar diet, exercise, and sleep behaviors—all of which can affect cycles.

We say: Myth or no, the feelings of sisterhood that come with it are real.