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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 ...。《快乐东西3》是一部动画情景喜剧 ，以描写中国老北京胡同中，一对孪生兄妹的家庭生活为题材，故事中的人物个性鲜明、生活气息浓郁、平易近人的情景喜剧风格轻松自然。影片在暴笑的同时，突出刻画中国人特有的亲情、友情与爱情观念，使人在放声大笑的同时，领悟出真正的生活内涵。。