Melatonin
Melatonin is a very important hormone since it regulates the circadian rhythm of the organism. Its secretion is regulated by light: when the light stimulus reaches the retina a signal is transmitted to the epiphysis where its secretion is inhibited. Darkness, on the contrary, stimulates its release. Melatonin plays a crucial role in regulating the sleep-wake cycle and is therefore essential for the physiology of sleep. By binding to its specific receptor, the hormone helps the body, reducing the...