Sleep-Wake Cycles

Definition

Sleep-wake cycles refer to the natural pattern of alternating between periods of wakefulness and sleep. These cycles are regulated by various physiological processes, including hormone production.

Related terms

Circadian Rhythm: The internal biological clock that regulates sleep-wake cycles over a 24-hour period.

Melatonin: A hormone secreted by the pineal gland that helps regulate sleep-wake cycles. It increases in darkness and decreases with exposure to light.

REM Sleep (Rapid Eye Movement): A stage of sleep characterized by rapid eye movements, vivid dreaming, and muscle paralysis. It is an important part of the sleep-wake cycle.