Sleep is essential to physical and emotional health. Adequate sleep may also play a role in helping the body recover from illness and injury.

A good night's sleep—everyone needs it, but not everyone gets it. We stay up late and get up early, and then wonder why we always feel tired.

Sleep apnea is a breathing disorder in which a person experiences brief interruptions of breathing during sleep.

The movies and television depict snoring as funny, even hilarious. But snoring is no joke: It's a medical problem that can have serious health and social implications.

Do you have sleep debt? Lack of sleep, or "sleep debt," can leave you feeling tired, listless and sleepy on a daily basis.

If you experience difficulty falling asleep, staying asleep, or enjoying a restful night's sleep, you may be suffering from insomnia.

Insomnia, trouble falling asleep or trouble sleeping, is a growing problem in the United States.