ICD-11 definition : Circadian rhythm sleep-wake disorders are disturbances of the sleep-wake cycle (typically
manifest as insomnia, excessive sleepiness, or both) due to alterations of the circadian
time-keeping system, its entrainment mechanisms, or a misalignment of the endogenous
circadian rhythm and the external environment.;
ICD-11 synonym : Disorders of the sleep-wake schedule; sleep wake schedule disorder nos; Delayed sleep phase syndrome; disturbed nyctohemeral rhythm; disorder of sleep-wake cycle; Irregular sleep-wake pattern; sleep rhythm problem;
Circadian rhythm sleep-wake disorders are disturbances of the sleep-wake cycle (typically
manifest as insomnia, excessive sleepiness, or both) due to alterations of the circadian
time-keeping system, its entrainment mechanisms, or a misalignment of the endogenous
circadian rhythm and the external environment.