Deep sleep is one of the most essential stages of the sleep cycle, playing a vital role in how well you feel both physically and mentally. Often referred to as slow-wave sleep or delta sleep, this ...

How much sleep do you need at different ages? Doctors explain age-wise sleep requirements, why sleep needs change across life stages, and when poor sleep becomes a health concern.

Don’t sleep on this disturbing news. The adverse effects of chronic sleep deprivation are well-documented, but it turns out that a shortage of shut-eye for just a single evening is very bad for you ...

Getting enough sleep is easier said than done — that's where napping comes in handy. Whether you're looking to catch up on rest after a sleepless night or relax in the afternoon, napping is an ...

Sleeping for 7 to 9 hours at night isn't the only way to catch some z's. Here are four alternative sleep cycles -- and they're pretty obscure. Annie Miller Medical Reviewer Annie Miller is a licensed ...