A new study suggests that a certain number of hours of sleep each night — between 6.4 and 7.8 hours to be exact — is ...

Eight hours a night, they told you. Maybe not.

New research says sleep is the second biggest factor in how long you live. Here's what the science actually means for you.

A new study reveals that people who sleep too little or too long show signs of accelerated biological aging and higher ...

Though it might seem like the question "How much sleep do you need" gets a new answer every other week, the The National Sleep Foundation says its new chart breaks the question down like never before.

It can be tough to calculate exactly how long you’re in REM, but many health trackers use your heart rate, heart rate variability, and data on your movements to make solid estimations. (Just know that ...

That’s the nightly sleep recommendation we hear most frequently, the highly-promoted gold standard for a healthy sleep routine. But what if it isn’t? I read this recent article in the Wall Street ...

Could a certain number of hours of sleep at night be key to optimizing health? Maria Korneeva/Getty Images According to the National Institutes of Health, quality sleep is as essential for our ...