19 年前
视频简介
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 ...。TNT正式宣布续订《陨落星辰》（Falling Skies）第五季，但这将是该剧的最后一季。最终季的订数退回常规的10集（该剧本季有12集）。。
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