in Chemical Coordination and Regulation (Endocrine System) by

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Melatonin hormone is produced by the pineal gland (a pea-sized gland located deep within the brain) during night.

This hormone is also referred as 'hormone of darkness' because the rate of its secretion rises too high at night and falls during daylight.

It helps regulate certain biorhythms, such as sleep patterns (controls circadian and circannual rhythms).

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