Sara Mednick, an associate professor of psychology at UC Irvine, said her research suggests that menstrual cycles and their effects on sleep might have something to do with it. In a study published in November 2017, Mednick and her team tested the memories of men and women before they took a nap. Women were tested twice at different points in their menstrual cycles, when hormonal changes prepare the body for the possibility of pregnancy.

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