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OTC melatonin may help regulate circadian rhythm disorders in: Melatonin promotes sleep through its effects on the DMN.Īlthough melatonin is a naturally occurring hormone, it is also available as an OTC sleep aid for people who have difficulty falling asleep or staying asleep through the night. The collective term for these regions is the default mode network (DMN). Melatonin acts on regions of the brain that are active when a person is not engaged in a specific mental or physical task. As the sun sets, the decrease in light signals melatonin production. During daytime hours, the retinas in the eyes absorb light, which tells the pineal gland to stop releasing melatonin. Melatonin is a hormone that regulates the body’s circadian rhythms.
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