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Addenbrookes Hospital in Cambridge has just finished a clinical trial on 40 pineal cyst patients to try to answer the question as to whether this operation is causing a real, or placebo improvement.

It had a prominent pineal foramen -- a hole in the top of its head that many lizard species use to sense sunlight and judge the length of daylight hours.

Melatonin is produced naturally in the pineal gland to signal the body that it is time to sleep and regulate its circadian rhythm -- the physiological cycle over a 24-hour period.

These supplements, including sugary gummies, typically offer much higher doses than what the pineal gland produces to help shift circadian rhythm to night mode.

Melatonin is a naturally occurring hormone produced by the pineal gland, a small structure at the center of the brain.