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non-24-hour sleep-wake disorder

(Non-24, free running disorder, hypernychthemeral disorder, non-24-hour circadian rhythm disorder)

is a kind of:

mental disorder » Dyssomnias » Circadian Rhythm Sleep Disorder
mental disorder » Circadian Rhythm Sleep Disorder
mental disorder » Sleep Disorders » Circadian Rhythm Sleep Disorder

An otherwise normal sleep-wake cycle that is not entrained (for example due to blindnes) but rather runs free with a time period substantially less or greater than 24 hours.

This term appears in

sleep disorders medicine