While you sleep tonight, your brain will quietly replay pieces of your day. Not like a movie, and not in order, but in rapid, ...

Evening coffee has sparked controversy for years. Some people fall asleep without difficulty, while others toss and turn for ...

When you think of people with sleep apnea, maybe you picture loud, cartoonish snoring, or assume you’d know something was wrong because you’d wake up feeling completely wiped out every morning. But ...

When you’re short on sleep and your focus suddenly drifts, your brain may be briefly slipping into cleanup mode. Scientists discovered that these attention lapses coincide with waves of fluid washing ...

Consequently, we humans, as well as all other organisms, developed a circadian rhythm in our physiology and behaviors with ...

Nearly everyone has experienced it: After a night of poor sleep, you don't feel as alert as you should. Your brain might seem foggy, and your mind drifts off when you should be paying attention. A new ...

This article is a part of CNN Underscored’s Guide to Sleep, a weeklong focus on everything you need to sleep better. We’ll be featuring new products, tips and exclusive deals all week, so check in ...

When you're trying to sleep well, there common rules, like no caffeine after 2pm, no phones in the bedroom. But sleeping in 90 minute segments probably isn't a habit many people strive to implement.