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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 what's 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 ...。For a neighborhood as renowned for its spectacular holiday displays as Evergreen Lane, the street has long been modest when it comes to Halloween. But when fun and spooky new neighbors, Luna and Marvin move to the block, Emily, Jared and the rest of the HOA agree to get in on the seasonal fun and launch EverSCREAM Lane to fundraise for a local charity. As the block pulls togeth...。