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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 ...。杨树屯村召开了选举新村长大会。候选人杨义（李东坡饰）和三叔杨四维（姜文义饰），通过投票最终杨四维以一票胜出，当选了新村长。村民让三叔解决目前的实际问题，三叔却把责任都推在杨义身上……。