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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 ...。一艘宇宙飞船搭载着三位科学家飞往火星执行科研任务。起飞后，队长意外发现飞船上竟然滞留了一名地面工程师。同时，飞船空气净化系统遭到永久破坏，剩余的氧气只能支持三人存活。谁生，谁死？四人进退两难之际，科研小队的医学家提出了一个危险的求生计划。。