How does a sleep tracker on your finger compare to one in a bed? I tested Sleep Number and Oura for a month to find out. Plus, expert sleep-tracking tips. Aly Lopez Former Writer I Aly Lopez was a ...

How does your brain know when it's time to sleep? There are two main factors: Hours Awake. The longer you've been awake, the stronger your drive for sleep. Circadian Rhythm. Your body operates on a ...

Sleep is a moving target. When you were a newborn, you slept for most of the day, then less as an older child; as a teen, you slept later. A senior’s bedtime is earlier—part of a lifetime journey of ...

The following essay is reprinted with permission from The Conversation, an online publication covering the latest research. “Avoid screens before bed” is one of the most common pieces of sleep advice.