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NOVA Mysteries of Sleep Like virtually every other animal humans need sleep to survive But why What do we gain from spending nearly a third of our lives in such a defenseless state And whats at stake if we sleep poorly The functions of sleep have long been something of a mystery But now scientists are peering deep into the brain to see what happens while we snooze One study reveals that welltimed bursts of pink noise can nudge a persons brain waves extending periods of slowwave or deep sleep And toddlers learning new words show that taking even a short nap after learning something new can help the information stick And when it comes to sleeping poorly it may turn out that having interrupted sleep can be just as harmful as missing sleep altogether As scientists come to understand the powerful role that sleep or lack of it plays in everything from memory to trauma to emotion regulation one thing is clear This biological function is as crucial as it is complex
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