The circadian rhythm embraces the variability that occurs within 24 hours.
D002940:Circadian Rhythm / Q000502:physiology*; D004569:Electroencephalography; D004827:Epilepsy / Q000150:complications; D006801:Humans; D012890:Sleep / Q000187:drug effects / Q000502:physiology*; D012893:Sleep Wake Disorders / Q000503:physiopathology