Sleep

We used to think everyone needed eight hours of sleep. Not so, according to new science

New research on its physiology shows why we need to take slumber seriously

Dark images from the screening room of your brain

It's become a virtually unchallenged piece of conventional wisdom that exposure to blue light—the type emitted by electronic device screens—is bad for sleep. That thinking has spurred a mini-industry of innovations meant to stop those...

Here's how sleep influences grades

Sweet dreams