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.
Restless legs syndrome
Periodic limb movement disorder
Toxin-Induced Sleep Disorder
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
Shift Work Sleep Disorder
Irregular Sleep Wake Rhythm Disorder
Familial Advanced Sleep-Phase Syndrome
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