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老农民阿方索回到了自己的家乡照顾身患重病的儿子，他重新找到了曾经居住的老房子，却发现自己的前妻带着女婿和外孙依然住在这里。等待着他的故乡已经几乎变成一片荒原，庞大的甘蔗种植园环绕着他的老房子，日夜烟雾缭绕。阿方索17年前抛下家人离开，如今他试图重新返回，挽救亲情，却发现在这个已经物是人非的地方，很多答案只能自己去寻找。。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 ...。