By Meirav Devash

95 percent of women believe this is true.

Ladies in close proximity all get their periods at once, right? A full 95 percent of women say they believe in such “menstrual synchrony,” yet the science is suspect.

Yes, one study found that women living in the same dorm bled in unison, but follow-up studies haven’t been able to replicate that result.

READ MORE: Why Are Some Periods Worse Than Others

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

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

Looking for more info on periods? Here is everything you need to know about your menstrual cycle, plus how to use your period to fuel your workout.

This article was originally published on www.womenshealthmag.com