Pineal Gland

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The Pineal gland is a small, pea-shaped gland in the brain.

 It secretes Melatonin hormone ........
Melatonin is a hormone from the pineal gland that helps regulate biological rhythms such as sleep and wake cycles. In other words, it's melatonin that directs your internal clock - the one that allows you to wake up about the same time every morning without an alarm clock.

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