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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 ...。世人皆知年轻帝王燕清玄的心尖宠，正是被誉为塞北明珠的乌雅族公主乌雅棠梨。冷血多疑的帝王，只为她俯首折腰。而她家世显赫，自由率性长大，却也甘愿为燕清玄舍弃自由天地，困于紫禁城中，倾心相守，她将是未来的大燕皇后，已是公开的秘密。。