01/13/2014 10:15 am ET Updated Jan 23, 2014

If The Brain 'Takes Out The Trash' During Sleep, What Happens If We Don't Sleep Enough?

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Sleep seems like a perfectly fine waste of time. Why would our bodies evolve to spend close to one-third of our lives completely out of it, when we could instead be doing something useful or exciting? Something that would, as an added bonus, be less likely to get us killed back when we were sleeping on the savanna?

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