Pixel-Shot/Shutterstock Sleep isn’t just a luxury, it’s a vital process that helps our bodies repair and rejuvenate. Researchers have started

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Pixel-Shot/Shutterstock Sleep isn’t just a luxury, it’s a vital process that helps our bodies repair and rejuvenate. Researchers have started
fizkes/Shutterstock Melatonin is a naturally occurring hormone that regulates the sleep-wake cycle. It’s also often used as a medication for