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Blue eyes by Tetyana Moshchenko - Photo 43919764 / 500px

Photographe : Tetyana Moshchenko https://500px.com/chudesa

Melatonin is a hormone that is created in the human pineal gland, a pea-sized gland located just above the middle of the brain. Part of its crucial role is to regulate the circadian rhythm and therefore modulate the sleep-wake cycle.