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1、任曉雪英語122班1210010210HealthySleepInpeople'slife,onethirdofthetimeisspentinsleep.Withoutnormalsleep,wecannotsustainotherlifeactivities.Sleepcanrefreshourmindsandimprovememoryability.Ensuringadequatesleeptimeandsleepingefficientlyisvitalforlearningandworking.Wesleepeveryday,butrar
2、elythinkdeeplyaboutit.Sleepcanbedividedintotwoperiods:rapid-eye-movementsleep(REMsleep)andnon-rapideyemovementsleep(non-remsleep).Theformercanprotectthebrain,relieveemotionsandrestoreenergy,whilethelattercaneliminatefatigue,restorephysicalstrength,enhanceimmunity,recoverybodyc
3、apacityandpromotegrowthanddevelopment.Whatsleepcanbringus?Perhapstheanswerisnotveryclear.However,ifweputthisquestioninturn,whatifwedonotsleepwell,thentheanswercanbesurprisinglyobvious,ormaybenotobviousbutsurprising.Today,peoplearefacedwithavarietyofpressuresinlife.Studentsmust
4、completetheirstudies;workershavetocompletetheirwork,sosometimespeoplehavetostayuplate.Allthesecantakeupsleeptime.Theresultsdoharmtoourhealthseverelyandmayeventhreatthesafetyofothers.任曉雪英語122班1210010210Studiesshowthatlackofsleepcandamageourattention,alertness,concentrationofmin
5、d,reasoningandproblem-solvingabilities,whicheasilyleadtoinjuriesandaccidents.Furthermore,sleepdebtcanincreasetheriskofmanydiseases.Forinstance,amonginsomniacs,themorbidityofheartdisease,hypertension,stroke,diabetesandetc.ishigherthannormalpeople.Inaddition,lackofsleepandsleepd
6、isorderscanalsoleadtodepression,cutislaxa(theskinrelaxation)andpachulosis(roughskin).Interestingly,lackofsleepcanenhancepeople'ssenseofhunger.Datashowthatpeoplesleeplessthanfivehoursadayaremorecloselyrelatedwithobesityeventheriskofdeath.AndbothAmericanandChineseofficialdatasho
7、wthatfatiguedrivingcausedbysleepdeprivationhasbeenaglobalroadsafetyproblem.Unfortunately,thefactisdifferentwithalotofpeople'smisunderstandingthatafewhoursofsleepafterstayinguplatecannotmakeupactually.Inmanycases,sleepdeprivationiscausedbyoursubjectivewills.However,therearemany
8、objectivelypathologicalchangescanmakeussleeplessorpersistents
