Non-24-hour sleep-wake syndrome
ICD-10 Code
G47.24
Non-24-hour sleep-wake syndrome
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.
Also known as circadian rhythm sleep disorder, free running type, circadian rhythm sleep disorder, free-running type, hypernychthemeral syndrome, non-24, Non-24-Hour Sleep-Wake Disorder — per MONDO