Sleep and dreaming: Why can't we stay awake 24/7?

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Source: http://feeds.newscientist.com/c/749/f/10897/s/286035b5/l/0L0Snewscientist0N0Carticle0Cmg217290A210B70A0A0Esleep0Eand0Edreaming0Ewhy0Ecant0Ewe0Estay0Eawake0E2470Bhtml0Dcmpid0FRSS0QNSNS0Q20A120EGLOBAL0Qonline0Enews/story01.htm

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