Why do we need sleep?

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Why do we need sleep?
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Clip from Behind the News Special  |  ABC ME  |  August 23, 2017
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What actually happens after we close our eyes? BTN investigates what goes on in our brains while we are sleeping and why sleep is so important for us.

What actually happens after we close our eyes? BTN investigates what goes on in our brains while we are sleeping and why sleep is so important for us.

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