How Do Melatonin Levels Affect Sleep?

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Melatonin is the hormone that is produced when we sleep in absolute pitch dark. So if you're sleeping in any light whatsoever, your body will not make melatonin. Melatonin allows us to go into deep sleep, recuperative sleep. It repairs your skin cells, your muscle cells, it's immune enhancing and it also helps counteract stress and it boosts your thyroid.

So, if you have low levels of melatonin your metabolism will be slower and you'll tend to have more sleep disruption.