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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 ...。One evening in Mexico City Ana and Alejandro are held up at gunpoint by two men, Alejandro is murdered during the assault because he had only two hundred pesos on him. The violence of his death awakens existential questioning among his close group of friends. Daniel, Christian and Ana, are faced with the uncertain path their lives have taken. Uncertain love stories, revealing f...。