The pineal gland is a small endocrine gland located in the brain, roughly in the center of the skull. It is part of the epithalamus and is responsible for the production of the hormone melatonin, which regulates the sleep-wake cycle and other circadian rhythms in the body.
The pineal gland is often referred to as the “third eye” due to its association with spiritual and mystical experiences. It has also been the subject of much research and speculation regarding its role in human physiology and consciousness.
Further Reading:
What the Chinese Medicine Clock Can Tell You about Your Health
Endocrine System Structure, Function, and Health Tips