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NOVA 47x4 - Mysteries of Sleep

    

Midnight
At My TV

From fruit flies to whales, virtually every animal sleeps. Butwhy? Why do we need to spend nearly a third of our lives insuch a defenseless state? Scientists are peering more deeplyinto the sleeping brain than ever before, discovering just howpowerful sleep can be, playing a role in everything frommemory retention and emotional regulation to removing wastefrom our brains. So why are we getting so little of it?

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