Official advice says that healthy adults require 7 to 9 hours of sleep every night for physical and mental health. Anything below this and you risk long-term sleep deprivation, which in turn elevates ...

A polyphasic sleep schedule breaks sleep into multiple short periods each day instead of one long stretch at night. These schedules can lead to sleep deprivation and health risks because they often ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." We all could probably use a little more energy these days, right? Maybe you’re managing a busy job, ...

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 ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." We all could probably use a little more energy these days, right? Maybe you’re managing a busy job, ...