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.

Learn how to feel energized after lunch—without coffee.

Do women really need more sleep than men? How much sleep is enough? Find answers to these common sleep health questions.

Follow these tips to create a safer sleep haven.

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

Following these tips may help you get the rest you need.