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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 ...。影片讲述了香港警察赵铁板（林威）因抓捕犯罪头子黑豹（狄威）惹下祸根，妻子与一双儿女被杀，赵因报仇追黑豹到地狱中，经过顽强拼杀，最终将罪犯绳之以法.。