Читать книгу Sleep: The secret to sleeping well and waking refreshed - Prof. Idzikowski Chris - Страница 21

Melatonin is secreted by the pineal gland in the brain (often known as the ‘third eye’ in reptiles because of its sensitivity to light), and is the hormone that ‘tells’ the brain it is dark. Secretion starts when it gets darker, peaks in the middle of the night and stops at dawn. Melatonin is believed to be an important synchronizer of other circadian rhythms and is closely connected with Seasonal Affective Disorder (SAD) and jet lag.