CircadianRelating to the internal body processes that occur on a 24-hour cycle
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Being, having, characterized by, or occurring in approximately 24-hour periods or cycles
NeuroscienceA scientific study of the nervous system
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A branch of the life sciences that deals with the anatomy, physiology, biochemistry, or molecular biology of nerves and nervous tissue
MelatoninA hormone that regulates sleep-wake cycles
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A hormone secreted by the pineal gland in the brain that regulates the sleep-wake cycle
REMA phase of sleep characterized by rapid eye movement, dreaming, and bodily movement
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A stage of sleep that occurs several times a night and is characterized by desynchronized brain waves, eye movement, loss of muscle tone, and vivid dreams
InsomniaA sleep disorder characterized by difficulty falling or staying asleep
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Chronic inability to fall asleep or remain asleep for an adequate length of time