Which hormone, produced by the pineal gland, plays a key role in regulating the sleep-wake cycle and is often associated with promoting sleepiness?

Explanation

Melatonin is a hormone produced by the pineal gland, a small gland located deep within the brain, and it plays a key role in signaling to the body that it’s time to feel sleepy, with its production naturally increasing in response to darkness and decreasing in response to light exposure. This hormonal signal helps regulate a person’s natural sleep-wake cycle in coordination with the body’s broader circadian rhythm. Melatonin supplements are sometimes used to help address certain sleep difficulties, such as those related to jet lag or irregular sleep schedules. Explore more Everyday Science MCQs on mcqstutor to keep practicing.