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-Alfred Dreyfus
Biological Clock
An internal mechanism that regulates bodily rhythms and cycles, such as sleep and wakefulness, over approximately a 24-hour period.
Melatonin
A hormone produced by the pineal gland that regulates sleep-wake cycles, its production increases in darkness to promote sleep.
Circadian Rhythms
Variations in behavior, physical condition, and mental state that occur on a 24-hour loop, primarily triggered by environmental light and dark conditions.
Circadian Rhythms
Natural, internal processes that regulate the sleep-wake cycle and repeat roughly every 24 hours.
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