Tired?Weallknowthefeeling.Irritable,groggyandexceptionallylazy.Chancesare,youdidntsleepenoughlastnight,orthepastfewnights.

累了这感觉我们都懂。脾气暴躁浑身乏力懒惰成性。这可能是因为前些天晚上你没有睡够。

But,whatexactlyisenoughsleep?Andmoreimportantly,canyouevercatchuponit?Well,theveryfunctionofsleepisstilldebatedbyscientists,wedoknowthatitisnecessarytofunctionefficientlyandproductively.

不过怎么才算睡够呢？更重要的是缺的睡眠能补上吗？尽管科学家对睡眠准确功能仍有争议，我们能明确地说它对快速高效地工作至关重要。

Afterall,wespend24yearsofourlifetimesleeping,itdbetterbeimportant,Researchershavetestedhowmuchisrequiredeachnightbyassigninggroupsofpeopleto4,6and8hoursofsleepoverextendedperiodsoftime.

毕竟人的一生中有24年在睡觉其重要性可想而知。研究者试图检验出人每晚所需的睡眠时间，通过一段时间内让多组实验者每天晚上睡46或8小时。

After14days,thosewith8hoursofsleepexhibitedfewerattentionlapsesorcognitiveissues.However,thosewith6or4hoursofsleepshowedasteadydecline.Infact,afteronly2weeks,the6hurgroupshowedasimilarreactiontimetoapersonwiththebloodalcoholconcentrationof0.11%whichisconsideredlegallydrunk,The4hourssleepersufferedevenmoreoccasionallyfallingasleepduringtheircognitivetests.

14天后每晚睡8小时的人，更少出现注意力分散或认知问题。而每晚睡6或4个小时的人在此方面出现显著下降。仅仅两周后睡6小时的人所做出的反应，同血液酒精含量为0.1%的醉酒者相当。睡4小时的人在认知测试期间更常打瞌睡。

Inbothgroups,brainfunctionsdecreasedaybyday.almostlinearly,withnosignoflevelingoff,scientistshavedubbedthiscumulativeeffectassleepDept,So,canwerecoverfromit?

两组实验者的大脑功能日渐减退，其趋势呈直线下降没有稳定的趋势。研究者将这种累积效应称为“睡眠负债”。那么我们能从中恢复吗？

Afteranightortwooflittlesleep,studyshowthatthebodyandbraincanfullyrecoverwithafewnightsofgoodsleep.However,withlong-termsleepdeprivationonthescaleofweekstomonths,therecoveryofcognitivefunctionismuchslower,requiringmanymorenightsofqualitysleep.Onthetimescaleofmonthstoyears.

经过一两个不眠之夜后，研究发现几天的好觉可使身体和大脑彻底恢复。而经过数周甚至数月的长期睡眠剥夺后，认知功能的恢复会慢得多，需要更多天数的高质量睡眠，而数月数年[睡眠剥夺]之后.

Itsunknownwhetherbrainfunctioncouldbefullyrepaired,orifitcausespermanentdamage,Paradoxically,withchronicsleepdeprivation.yoursleepinessorhowtiredyoufeeldoeseventuallyleveloff.meaningthatyoube







































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