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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 ...。在整个AFL历史上最具挑战性的赛季之一中，跟随六支澳大利亚足球联赛球队的标志性AFL身份迈向2020年总决赛。。