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The Pineal Gland
The pineal gland is a tiny, pine cone-shaped gland, the size of a grain of rice in humans, located deep within our brains.
The pineal gland secretes the hormone melatonin, which helps us to sleep soundly during the night. The pineal gland is intimately involved in managing our night-day cycle of sleeping and waking patterns, i.e. our daily circadian rhythm.
The pineal gland is thought to produce a number of other active substances and may also be involved in triggering various stages of our development, e.g. puberty.