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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 ...。本季由查尔斯·丹斯担任旁白解说。备受欢迎的《野蛮王国》在非洲荒野再度上演，内敌反叛、杀戮争斗、狮子王的权力原罪···看自然界猛兽之间的生存大战。。