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The pineal gland is a tiny pinecone-shaped gland situated in the center of the human brain, just right between the left and the right hemispheres. What we know is that the pineal gland's function is to produce serotonin and melatonin – the neurotransmitters that regulate our waking and sleeping cycles – hence creating what’s scientifically referred to as the Circadian rhythm. Many ancient religions and cultures including the Babylonians, Indonesians, Egyptians, Greeks, Romans, and Christians include symbolic representations of the pineal gland all over their texts.