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NOVA:MysteriesofSleepLikevirtuallyeveryotheranimal,humansneedsleeptosurvive.Butwhy?Whatdowegainfromspendingnearlyathirdofourlivesinsuchadefenselessstate?Andwhat'satstakeifwesleeppoorly?Thefunctionsofsleephavelongbeensomethingofamystery.Butnowscientistsarepeeringdeepintothebraintoseewhathappenswhilewesnooze.Onestudyrevealsthatwell-timedburstsofpinknoisecannudgeaperson'sbrainwaves,extendingperiodsofslow-wave,ordeep,sleep.Andtoddlerslearningnewwordsshowthattakingevenashortnapafterlearningsomethingnewcanhelptheinformationstick.Andwhenitcomestosleepingpoorly,itmayturnoutthathavinginterruptedsleepcanbejustasharmfulasmissingsleepaltogether.Asscientistscometounderstandthepowerfulrolethatsleep--orlackofit--playsineverythingfrommemorytotraumatoemotionregulation,onethingisclear:Thisbiologicalfunctionisascrucialasitiscomplexaaa