Similar term(s): melatonine.
Melatonin is a hormone formed by the pineal gland (which is located in the center of the brain). Melatonin regulates the sleep-wake cycle and is stimulated by darkness and inhibited by light. Melatonin is also available in some countries as a drug or a dietary supplement which acts against insomnia and jet-lag.
Source: GreenFacts
Español: Melatonina
Français: Mélatonine