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. These can include dyssomnias such as circadian rhythm disorders, hypersomnia, and sleep apnea and parasomnias such as bruxism and rapid eye movement sleep disorder. The disease is sleep-wake disorder (MONDO_0003406, a Monarch Disease Ontology identifier). Also known as: disorder of sleep-wake cycle, sleep wake disorder.