is an hormone found in humans which has been implicated in the processes of sleep regulation. Melatonin is secreted by the pineal gland as a product of the metabolism of the neurotransmitter serotonin. The hormone has been reported to have some impact on the stage of puberty too.

MELATONIN: "Melatonin is one of the major hormones associated with sleep in humans- it is secreted by the pineal gland."
Cite this page: N., Pam M.S., "MELATONIN," in, April 7, 2013, (accessed October 16, 2021).