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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 ...。Christmas store owner Emily Lane's sleuthing skills are put to the test as she investigates local murders. Despite Detective Sam Wilner's growing affection for her, Emily's enigmatic past raises suspicions about her true motives.。