Sleepissomethingwealldo.Butsomepeopleneedtosleepmorethanothers.Babiessleepmostofthetime.Childreninschoolsleepabouttentotwelvehoursanight.Mostgrown-upssleeponlysevenoreighthours.小题1:Allpartsof

　　Sleepissomethingwealldo.Butsomepeopleneedtosleepmorethanothers.Babiessleepmostofthetime.Childreninschoolsleepabouttentotwelvehoursanight.Mostgrown-upssleeponlysevenoreighthours. 小题1:

　　Allpartsofourbodieshavetorestaftertheywork.Ourarmsneedarestafterweliftheavythings.Whenwerunfast,ourlegsworkhard.Theygettired.Wehavetorestthem.Ourbrainsworkhard,too. 小题2:72 Wecansitquitestillandrestourarmsandlegs.Butourbrainsaren’tresting.Theygorightonthinkingaslongasweareawake.

　　Ourbrainsslowdownabitwhenwesleepanddream. 小题3: Insteadofthinkingwide-awakethought,ourbrainsmakeupdreams.Somedreamsareverypleasing.Somearenot.Mostofthetimeweforgetthemwhenwewakeup.

　　Scientistshavetriedtofindoutwhatwouldhappenifpeoplewerenotallowedtosleep.Theyaskedsomepeoplenottogotobed.Thepeoplestayedupallnightandallthenextday.Theystayedupthenextnight,tooandthedayafter.Theyplayedgames.Buttheymademistakes.Theyforgotthings. 小题4: .Thepeoplegrewrudeandmean.Theybecameangrywiththeirfriends.Finallytheyweretootiredtostandup.Themomenttheysatdown,theyfellasleep.

　　Scientistsfoundthatifpeoplearenotallowedtosleep,theyactinanunusualway.

　　小题5: Butwedoknowthatweneedittostaywell.

　　Sotonighthaveagoodsleep.Liedownunderthecovers.Shutyoureyes.Letyourthoughtstravelabout.Soonyou’llstopthinking.You’llbeasleep.A．Butevenaswesleepourbrainsaredoingsomework.B．Itwashardfortheirtiredbrainstowork.C．Whenweareawake,theyhelpuspayattentiontotheworldaroundus.D．Nooneknowsquitesurelywhysleepissogoodforus.E.Goodsleephelpstoimproveone’smemory.

　　F.Butbabies,childrenandgrown-ups----allofusneedtohaveoursleep.