Which of the following hormones is particularly involved in regulating sleepiness?

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Melatonin is a hormone that is primarily involved in regulating sleepiness. Its production increases in the evening and helps regulate the sleep-wake cycle, making us feel sleepy at night. Cortisol and norepinephrine are both involved in regulating the body's stress response, while growth hormone is important for growth and development.

Which of the Following Hormones Is Particularly Involved in Regulating