/non-24-hour sleep-wake syndrome

non-24-hour sleep-wake syndrome

Rare Disease

MONDO:0019137

Also Known As

Non-24-Hour Sleep-Wake Disordercircadian rhythm sleep disorder, free running typecircadian rhythm sleep disorder, free-running typehypernychthemeral syndromenon-24non 24 hour sleep wake disorder

Definition

Non-24-hour sleep-wake disorder (non-24 disorder), also known as hypernychthemeral syndrome, is a circadian rhythm sleep disorder characterized by non-synchronization to a 24-hour day leading to insomnia and daytime sleepiness with sometimes severe associated manifestations.