How important is light for sleep-wake cycles?

Your brain's "master clock" is sensitive to light, explains Michael Timothy Smith, MA, PhD, director of the Behavioral Sleep Medicine Program at Johns Hopkins University. He discusses how that clock affects your sleep.

Too much screen time can harm sleep, mood, and much more.

Are you wondering if this popular supplement is a safe way to get more sleep? Get the facts.

Learn how sleep loss factors into higher anxiety and depression rates—and what to do about it.

You know that diet and exercise affect your blood sugar levels, but can sleep habits do the same? Get the facts about diabetes and sleep problems.

Get the facts about this popular sleep aid.