What is the role of melatonin in sleep disorders?

Correct answer is B) Melatonin is a hormone that regulates the sleep-wake cycle. Melatonin is a hormone produced by the pineal gland in response to darkness, and it plays a crucial role in signaling the body that it is time to sleep. It helps regulate the circadian rhythm and synchronize the sleep-wake cycle. While melatonin supplements are commonly used to address certain sleep disorders, particularly those related to circadian rhythm disruptions, it is not a stimulant and is not exclusively effective for all types of sleep disorders.