Dyssomnias

A dyssomnia is a disorder of getting to sleep or staying asleep or of excessive sleepiness. The person typically experiences changes in the amount and/or timing of sleep, and how restful it is. The dyssomnias are disorders of sleep or wakefulness, in contrast to parasomnias, which are about the sleep/wake transition.

Dyssomnias include extrinsic (caused by factors outside the body), intrinsic (caused by factors inside the body), and circadian-rhythm sleep disorders. When people say they have sleeping problems, they usually are referring to one or more dyssomnia.

Extrinsic

Insomnia

Apnea

Narcolepsy

Restless legs syndrome

Periodic limb movement disorder

Hypersomnia

Sleep state misperception

Toxin-Induced Sleep Disorder

Kleine-Levin syndrome

Intrinsic

Altitude insomnia

Insomnia due to substance use/abuse

Sleep-onset association disorder

Nocturnal paroxysmal dystonia

Limit-setting sleep disorder

Circadian-rhythm sleep disorders

Delayed Sleep Phase Syndrome

Advanced Sleep-Phase Syndrome

Jet lag - Time Zone Shfit Syndrome

Free-running disorder

Shift Work Sleep Disorder

Irregular Sleep Wake Rhythm Disorder

Familial Advanced Sleep-Phase Syndrome

Sleep Disorders

Dyssomnias

Parsomnias

Insomnia Medications