For most people alive today, a “good night’s sleep” means roughly eight uninterrupted hours in a dark room, followed by a single morning wake-up. Yet historical evidence suggests that this pattern is ...

Continuous sleep is a modern habit, not an evolutionary constant, which helps explain why many of us still wake at 3am and wonder if something’s wrong. It might help to know that this is a deeply ...

With so much to do heading into the busy holiday season, is anyone getting enough sleep? Most sleep experts advise that adults get seven to nine hours of sleep per night for good health and emotional ...