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Picture this—tucked away in the recesses of your brain, there's a little endocrine gland about the size of a grain of rice, influencing your cognitive abilities in profound ways. This is the pineal gland, sitting in a near central position in the brain. It plays a starring role in our circadian rhythms by regulating the release of melatonin, the hormone in charge of our sleep and wake cycles, and supporting our overall sense of well-being....