Everybodysleeps,butwhatpeoplestayuplatetocatch—orwakeupearlyinordernottomiss—variesbyculture.From datacollected,itseemsthethingsthatcauseustolosethemostsleep,onaverage,aresportingevents,timechanges,and holidays.Aroundtheworld,peoplechangedsleeppatternsthankstothestartorendofdaylightsavingstime.Russians,for example,begantowakeupaboutahalfhourlatereachdayafterPresidentVladimirPutinshiftedthecountrypermanentlyto“wintertime”startingonOctober26. Russia’sotherlatenightsandearlymorningsgenerallycorrespondtopublicholidays.OnNewYear’sEve,Russianshavetheworld’slatestbedtime,hittingthehayataround3:30am.RussiansalsogetupanhourlateronInternationalWomen’s Day,thedayfortreatingandcelebratingfemalerelatives. Similarly,Americans’latenightslatemornings,andlongestsleepsfallonthree-dayweekends.CanadagottheleastsleepoftheyearthenightitbeatSwedenintheOlympichockeyfinal. TheWorldCupisalsochieflyresponsibleforsleepdeprivation,theworstnightforsleepintheU.K.wasthenightofthe England-ItalymatchonJune14.Britsstayedupahalf-hourlatertowatchit,andthentheywokeupearlierthanusualthenextmorningthankstosummernights,thephenomenoninwhichthesunbarelysetsinnortherncountriesinthesummertime.Thatwasnothing,though,comparedtoGermans,Italians,andtheFrench,whostayeduparoundanhourandahalflateron variousdaysthroughoutthesummertowatchtheCup. Itshouldbemadeclearthatnoteveryonehasadevicetorecordtheirsleeppatterns,insomeofthesenations,it’slikely thatonlytherichestpeopledo.Andpeoplewhoelecttotracktheirsleepmaytrytogetmoresleepthantheaverageperson. Evenifthat’sthecase,though,theabovefindingsarestillstriking,ifthemosthealth-consciousamongushavesuchdeep swingsinourshut-eyelevelsthroughouttheyear,howmuchsleeparetherestofuslosing Whatdoestheauthorsayaboutpeople’ssleepinghabits《》()
A.They are culture-related B.They affect people’s health. C.They change with the seasons. D.They vary from person to person.正确答案A
