You’ve probably heard the standard advice about getting eight hours of sleep ... chronotypes—natural tendencies toward earlier or later sleep-wake times. The consistency within your chronotype ...

There is a truth universally acknowledged that kids need sleep, a lot of sleep. Yet, most adolescents fall short of the eight ...

The average person needs 7.5 hours of sleep ... to wake up from sleep cycles three and four. • If you sleep more than you need to you're probably going to wake up from a later sleep cycle ...