Melatonin appears to adjust the sleep phase of the sleep/wake cycle of some people. melatonin appears to adjust the sleep phase of the sleep/wake cycle of some people.

a. True

b. False

The answer is true. Melatonin is a hormone that is created by the pineal gland in animals and controls sleep and alertness. It seems to have 2 possible interacting effects on the sleep-wake cycle. First, it encourages sleep and stability in a "hypnotic" function by escalating the homeostatic coerce to sleep. Second, it entrains and modifies the process c in a "chronobiotic" function.