In-depth

Insomnia

Sleepless nights? Insomnia includes difficulty going to sleep, staying asleep or going back to sleep after you awaken. Insomnia may be temporary or chronic.

Narcolepsy

Narcolepsy causes overwhelming daytime drowsiness and sudden attacks of sleep.

Nightmares

Nightmares are usually harmless. Learn what causes nightmares — and what to do about them.

Sleep apnea

Sleep apnea causes people to repeatedly stop breathing during their sleep. Common signs of this sleep disorder include loud snores punctuated by periods of silence.

Sleep apnea, central

Central sleep apnea is an uncommon condition that occurs when your brain has problems controlling your breathing during sleep.

Sleep apnea, obstructive

Obstructive sleep apnea is the most common type of sleep apnea — a condition that causes you to repeatedly stop breathing while you sleep.

Sleep terrors (night terrors)

Sleep terrors (night terrors) are usually harmless, but they're scary. Learn what causes sleep terrors — and what to do about them.

Sleepwalking

Sleepwalking is usually harmless. Learn what can happen during a sleepwalking episode — and what to do about it.

Snoring

Snoring may be just a nighttime annoyance, or it may indicate a more serious health condition. It can also disrupt your life and relationships.

Dec. 06, 2011