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 ...。准备迎接一个由美妙祝福衍生的爱情故事,但没有获得的祝福。各种形式的爱情会是什么样子? 你还会相信这个魔法吗?。