13 年前
视频简介
As the SUN burns out, an American family gathers at the end of the world, their hopes for rescue slowly crumbling as they also confront long lasting divides amongst each other.。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 ...。
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