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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 ...。孤儿周伟杰与李卓豪一日因偷窃被追捕。伟杰被捉拿而卓豪逃去。二人从此失去联络，伟杰被探长林昌收养，与昌女儿秀芳青梅竹马，卓豪则成为黑帮流氓。多年后二人重逢，虽际遇不同，旧情不改。不久，因黑白两道争斗，卓豪养父金经理暗中杀死林昌，伟杰向卓豪问明此事，卓豪不忍出卖养父，诈作不知。伟杰毅然加入警队，誓将凶手绳之于法，同时亦离开义妹秀芳。从此卓豪伟杰秀芳三人中断联络，各自生活。三年后，伟杰成为探长，卓豪亦为帮会第二号人物，二人又再聚首。卓豪对秀芳仍有爱意，但自知身份悬殊，遂设法撮合伟杰与秀芳。 卓豪养父被死对头杀死，其后手下查出凶手藏身之处，卓豪单人匹马去报仇，却中了奸计，原来其手下串通凶手，将卓豪禁锢，然后派人杀死伟杰，来一招贼赃嫁祸，陷卓豪于不义。杀手计划在伟杰秀芳成婚之日下毒手，幸好卓豪及时逃脱，即往婚礼通知伟杰，逃过一劫，不过卓豪为救伟杰而身受重伤。伤...。