About 30% of couples sleep separately at least some of the time, according to a study put out this summer by the American Academy of Sleep Medicine. The study found that millennials lead the trend, with 47% saying they've taken part in what's been deemed a "sleep divorce."

To learn more, Something Offbeat tracked down Dr. Wendy Troxel, a senior behavioral and social scientist at the RAND Corporation and the author of Sharing the Covers: Every Couple’s Guide to Better Sleep.