Circadian Rhythms: A pattern of behaviour that occurs or recurs approximately every 24 hours., Sleep–wake cycle , Hormone production, Core body temperature, Infradian Rhythms: Rhythms that have a duration of over 24 hours, and may be weekly, monthly or event annually., Mood (e.g. seasonal affective disorder), Menstrual cycle, Migration, Ultradian Rhythms: Cycles that last less than 24 hours., Sleep stages, BRAC (alertness),

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