学习英语的最好四篇文章

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1、SleepSleetispartofapersor/sdailyactivitycycle.Thereareseveraldifferentstagesofsleep,andtheytoooccurincycles.Ifyouareanaveragesleeper,yoursleepcycleisasfollows.Whenyoufistdriftoffintoslumber,youreyeswillrollaboutabit,youtemperaturewilldropslightly,yourmuscleswillrelax,andyourbreathingwellslowandbe

2、comequiteregular.Yourbrainwavesslowandbecomequiteregular.Yourbrainwavesslowdownabittoo,withthealpharhythmofratherfastwaves1sleep.Forthenexthalfhourorso,asyourelaxmoreandmore,youwilldriftdownthroughstage2andstage3sleep.Theloweryourstageofsleep,sloweryourbrainwaveswillbe.Thenabout40to69minutesafter

3、youloseconsciousnessyouwillhavereachedthedeepestsleepofall.Yourbrainwillshowthelargeslowwavesthatareknownasthedeltarhythm.Thisisstage4sleep.Youdonotremainatthisdeepfourthstageallnightlong,butinsteadabout80minutesafteryoufallintoslumber,yourbrainactivitylevelwillincreaseagainslightly.Thedeltarhyth

4、mwilldisappear,tobereplacedbytheactivitypatternofbrainwaves.Youreyeswillbegintodartaroundunderyourclosedeyelidsasifyouwerelookingatsomethingoccurringinfrontofyou.Thisperiodofrapideyemovementlastsforsome8to15minutesandiscalledREMsleep.ItisduringREMsleepperiod,yourbodywillsoonrelaxagairyourbreathi

5、ngwillslipgentlybackfromstage1tostage4sleep——onlytoriseonceagaintothesurfaceofnearconsciousnesssome80minuteslater.睡眠睡眠是人每天tl常活动循环的一部分。人的睡眠分儿个阶段，而这些阶段也是循环发生的。如果你是一个正常的睡眠者，你的睡眠循环会这样进行。在你开始昏昏入睡时，你的眼睛会滚动儿下，体温略有下降，肌肉放松，呼吸变得缓慢而有节奏。除了开始儿分钟比较快的C1节奏外，脑电波也稍有减缓。这被称为第一阶段睡眠。在随后约半小时内，你进一步放松，进入第二和第三阶段睡眠。睡眠越深入，脑

6、电波就越缓慢。大约在开始睡眠后的40到60分钟，你将进入沉睡状态。这时的脑电波表现为巨大的缓波，被称为&节奏。这就是第四阶段睡眠。但你并不是整夜都保持这种沉睡状态。入睡后约80分钟左右，你的大脑运动水平会再度略有提高。&节奏消失，并被脑电波的运动图形取代。你的眼睛会在闭着的眼睑下迅速转动，就好象你在看着眼前发生的什么事情。这种迅速的眼球运动持续约8〜15分钟，这一阶段睡眠被称之为快速眼动(REM)睡眠。在REM睡眠阶段，你的肢体会很快再度放松，呼吸也再次放慢并变得有节奏，你会轻松地从第一阶段滑入第四阶段睡眠■直到大约80分钟后重新接近清醒状态。Giveyourselfarelaxingd

7、ayThetimeyouspendattheofficemaybethemoststressfulpartofyourday,butitdoesn'thavetobe.Youhaveagreaterabilitytoshapeyourofficeenvironmentthanyoumayrealize.Takebreaksthroughouttheday.Itwillhelpclearyourmindandrelievepressu