Who gets to sleep, and for how long, is a complex mix of biology, psychology and society. Here’s what we know so far.

Sleep may not just be rest for the mind—it may be essential maintenance for the body's power supply. A new study by ...

We receive messages about the importance of sleep beginning in childhood. You may remember mandatory naps enforced by adults ...

Light sleep makes up a significant portion of our rest but the term might cause alarm in some if they think they’re getting too much “light sleep” and not enough “deep sleep.” Sleep trackers label it ...