How sleep is related to memory consolidation (creating lasting memories), refining memory traces by removing the unwanted ones from what is important, improving attention, creativity, productivity, reaction times etc. the next day, flushing out toxins among cells that are linked to neurodegenerative diseases and minimising hyperactive/impulsive behaviours (especially in children) etc. Further, why kids/children need more hours of sleep - because they get exposed to more new experiences/learning.

http://www.abc.net.au/news/2017-10-19/sleep-why-we-need-it-and-what-happens-when-we-dont-get-enough/9062534

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