Insomnia is the most common sleep complaint. It occurs when you have trouble falling asleep or staying asleep even though you had the opportunity to get a full night of sleep. The causes, symptoms and severity of insomnia vary from person to person. Insomnia may include:

Obstructive sleep apnea is a common and serious sleep disorder that causes you to stop breathing during sleep.

Narcolepsy is a lifelong sleep disorder that makes you feel overwhelmingly tired, and in severe cases, have sudden uncontrollable sleep attacks.

Restless legs syndrome is a neurological sleep disorder that make you have an overwhelming urge to move your legs.

Parasomnias are a group of sleep disorders that involve unwanted events or experiences that occur while you are falling asleep, sleeping or waking up.