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Imagine that human scientists developed a cure for brain aging - you go through genetic modification and now your brain is packed with hyperactive antioxidant enzymes, and as a result your brain never ages.

Theoretically, would we still need to sleep under these conditions?

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I actually think this is an interesting question, firstly aging needs to be defined more, with what occurs during sleep, I think this is answerable (although theoretical) –  user3543 Nov 17 '13 at 2:22
    
Not truly related to question, but probably related to possible answer (p.ex. we need sleep cause of muscle and tissue repair/regeneration) : cogsci.stackexchange.com/questions/3675/… –  Enoque Duarte Nov 19 '13 at 16:04
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