Final answer:
Melatonin, a hormone from the pineal gland, regulates circadian rhythms like the sleep-wake cycle based on light exposure.
Explanation:
Melatonin and Circadian Rhythms
Melatonin is a hormone produced by the pineal gland that plays a crucial role in regulating circadian rhythms, including the sleep-wake cycle. It is affected by the photoperiod with production increasing during the night. Melatonin's release is stimulated by darkness and inhibited by light, influencing our biological rhythms.
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https://brainly.com/question/31028598
