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Sleep is a hugely important restorative process for humans as well as all organisms across the animal kingdom. It is absolutely essential for the body, mind, memory, and learning . The brain, in particular, produces metabolic end-products such as reactive oxygen species that can damage and impair the function of brain cells. It is during sleep that these damaging end-products are cleared . In addition, anabolic hormones are preferentially released during sleep (such as growth hormone) that aid in the physical restoration process.