Abnormal sleep-wake schedule or pattern associated with the circadian rhythm which affect the length, timing, and/or rigidity of the sleep-wake cycle relative to the day-night cycle.

http://purl.bioontology.org/ontology/ICD10CM/G47, http://identifiers.org/mesh/D012893, http://identifiers.org/snomedct/39898005, http://purl.obolibrary.org/obo/DOID_535

http://purl.obolibrary.org/obo/MONDO_0005071, http://purl.obolibrary.org/obo/MONDO_0002025

sleep wake disorder, disorder of sleep-wake cycle

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MONDO:0003406