HowCanDreamsControlYourBody？Th

　　标题：HowCanDreamsControlYourBody？TheScienceOfSleepwalking
　　source：io9丨EstherInglisArkell
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　　Sleepwalkingisequalpartsfascinatingandterrifying。Thenotionwecanbeincontrolofourbodieswithouthavinganyresponsibilityforwhatwedoisincrediblyunnerving。Butwhatactuallyhappensinyourbrain（andyourbody）whenyousleepwalk？Hswhatsciencehasfoundout。
　　Topimage：SergeyNivensShutterstock。com
　　TheHairRaisingHistoryofSleepcrime
　　Sleepwalkinghasbeenrivetingdrama，eversinceLadyMacbethwonderedifthatwasadaggershesawbeforeher，thehandletowardsherhand。Theunquietmind，forcedtowander，actingoutunconsciousimpulses。Itfullyenjoyit。History，ancientandrecent，providesuswithhairraisingtales。
　　Somelegendsaboutsleepwalkingclaimthatthewalkersthemselvessometimesbravedanger。（Andtheyoccasionallydo。One15yearoldgirlwasfoundsleepingatthetopofa150footcraneafterhavingsleepwalkedupitinthenight。）
　　Mostly，though，readangertoothers。Thereisalonghistoryofsleephomicide。ThefirstwasinParis，in1630。Amanplannedtomurderanotherman。Thenightbeforehewastocarryoutthemurder，hedressed，grabbedhissword，swamacrosstheSeine，killedhisintendedvictim，swamhome，andwentbacktobed。Thisparticularinstanceofsleepcrimeactuallybecameaphilosophicalproblem。Atintendtocommit，butwhatiftheyintendedtocommititthenextday？
　　TsnowordonwhethertheParisianwasdeclarednotguilty。Throughtheyears，jurieshavehadtojudgetheculpabilityofsleepwalkerswhocommittedcrimes。Themostfamouscaseofsleephomicidehappenedin1987。Aman，worriedaboutrevealinghisgamblingdebtsandhisembezzlementtohisinlaws，wenttosleep，drovetotheirhouse，killedhismotherinlaw，andinjuredhisfatherinlaw，beforedrivingtothepolicestation。Hewasacquitted，buttheacquittalremainscontroversial。Generallythefewpeoplewhodocommitcrimesintheirsleepareconvictedandacquittedbasedonmanyfactors，includingwhethertheyconfessedimmediately，andwhethertheirconsciousmotivationslineuptooconvenientlywiththeirunconsciousactions。
　　MythsandRealities
　　Stressandworrycanprovokesleepwalking，andsleepwalkerscanactouttheirworriesintheirdreams。Theycanalsodothingscompletelyatrandom，retryingtoprevent。Tragically，someofthesleepwalkerswhohavekilledpeopleseemtohavedoneitbecausetheybelievedtheywereprotectingtheirlovedonesfromnonexistentfiresorburglars。
　　Weknowthisbecausethetotalamnesiathatsupposedlycomeswithsleepwalkingisamyth。Wreasleepjustlikeregulardreamersarealmosteveryoneremembersflashes。Somepeopleremembereverythingtheydreamedduringtheirwalk。Theyacknowledge，uponawaking，thattheirvisionsmadenosense，tcontrolthemselveswhileasleep。
　　Onesleepwalkerdescribedhowhewalkedoutofhisbedroomandsawhisdog。Althoughhecouldseethedogwaspeacefullysleepinghestillhadtheideathatitwasonfire。Hegrabbeditup，carriedittothebathroom，andputitundertheshower，atwhichhegotthesamerudeawakeningasthedog。Handwhathedidduringthatdream，t，atthetime，engagehiscriticalthinking。
　　Heobviouslysurvivedtotellpsychologistsabouthisdreamedupdogabuse，snorealproblemwithwakingasleepwalker。Ttgointoshock，orhaveaheartattack。Ttgiveway。Ttgetviolent。Theymerelyhaveaveryunpleasantawakening，whichiswhymostpsychologistsstresscoaxingsleepwalkersbacktobed。Noonelikestobeshakenawake，reontheirfeetornot。
　　TheSsBrain
　　Mostofthemedicalinformationaboutsleepwalkingstressestheriskfactors。Peoplearemorelikelytosleepwalkifoneoftheirparentsdoes。Ifbothoftheirparentsdo，thenachildhasasixtypercentchance。Youngchildrenaremorelikelytosleepwalk。Peoplewithsleepbreathingdisorders，likeapnea，aremorelikelytosleepwalk。Peoplewithrestlesslegsyndromearemorelikelytosleepwalk。Peoplewithnightterrorsaremorelikelytosleepwalk。
　　Basically，slikelytobeagifttothenextgeneration。
　　Asfaraswecantell，atonce。Thefirstisthepartthatismeanttobepercolatingwhilepeopleareasleep。Isnotthepartthatvividlydreams。StwalkduringREMsleep，butabouthalfanhourbeforetheyenterREMsleep。Thesecondpartofthebrainkeptawakeisthemotorcortex。Whenpeopletwitchintheirsleep，orwhenthepawsofcatsordogsflexintheirsleep，itsbecausethenervoussystemisdoingitsjob。Aneurotransmittercalledgammaaminobutyricacid，orGABA，shutsdowntheabilityofmotorcortextomakeanymajormovements。Wrerunning，butallwedoistwitch。WhenthereisinsufficientGABAinthesystem，thepartofthebraininchargeofmotorfunctionisstillfullyengaged，andwemoveasmuchaswewant，evenifwearetrappedindreamlogic。
　　Thisiswhychildrentendtosleepwalkmorethanadults。TtmakeasufficientsupplyofGABA。Asthenervoussystemmatures，sabletoupthesupply，andchildrengrowoutoftheirsleepwalking。Sometimes，theabilitytoswitchoffthemotorcortexneverreallyworks，andpeoplekeepwalkingintheirsleepthroughouttheirlives。Mostsleepwalkersendurenothingmorethanthestoriestheirfamiliestellabouttheirnocturnaladventures。