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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 ...。袁彩霞、穆村、常胜、刘懂是大学室友兼好友。多年以后，常胜去世，彩霞、刘懂、穆村再次聚在一起悼念常胜，却发现常胜给他们留下了一笔很大的遗产，但必须帮他完成三个愿望才可以得到遗产，于是三人开始帮常胜实现愿望，却发现这三个愿望都与他们三人有关。。