Your watch says you had three hours of deep sleep. Should you believe it? Millions of people rely on phone apps and wearable ...

If you use a sleep tracker at night, these are the three metrics you should be paying attention to in the morning.

You’ve heard of REM sleep but what about deep sleep? Experts share why it’s important and how to make sure you’re getting ...

Few experiences rival the calm satisfaction of falling asleep easily and waking up feeling fully rested. But sleep is more than a luxury or idle downtime, it’s a vital biological process that supports ...

Past studies show the ‘boost’ the brain receives from physical activity normally peaks within the first 10 to 20 minutes. Researchers from University College London have now found that the ...

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 ...