【5A版】大学英语10分钟presentation.pptx

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1、Thescienceofsleep1What’syourdailyrhythm?Doyouconsideryourselfamorningpersonoraneveningperson?Atwhattimeofdaydoyoufeelatyourbest?Consideringonlyyourown"feelingbest"rhythm,ifyouwereentirelyfreetoplanyourday—atwhattimewouldyougetupandgotobed?2Wehavetosleepbecauseit

2、isessentialtomaintainingnormallevelsofcognitiveskills,suchasspeech,memory,innovativeandflexiblethinking.Whydowesleep?3Whatwouldhappenifwedidn'tsleep?4Withcontinuedlackofsufficientsleep,thepartofthebrainthatcontrolslanguage,menmery,planningandsenseoftimeisseverel

3、yaffected,practicallyshuttingdown.Sleepdeprivationnotonlyhasamajorimpactoncognitivefunctioning,butalsoonemotionalandphysicalhealth.Moreover,it’llarousedisorderssuchassleepapnoeaandtheriskofobesity.Whathappenswhenwesleep?5non-REMREMSleepcycle6Non-REMsleepsleepSta

4、geone:LightSleephalfawakeandhalfasleepStagetwo:TrueSleeplastsaround20minutesStagesthree:DeepSleepThebrainbeginstoproducedeltawaves,atypeofwavethatislargeandslowStagefour:Deepsleeprhythmicbreathingandlimitedmuscleactivity7Thefirstrapideyemovement(REM)periodusuall

5、ybeginsabout70to90minutesafterwefallasleep.WehavearoundthreetofiveREMepisodesanight.REMsleep8Peopleliketosleepanywherebetween5and11hours,withtheaveragebeing7.75hours.Howmuchsleepisrequired?9SpeciesAveragetotalsleeptimeperdayPython巨蟒18hrsTiger15.8hrsCat12.1hrsChi

6、mpanzee黑猩猩9.7hrsSheep3.8hrsAfricanelephant3.3hrsGiraffe长颈鹿1.9hrAhardnight'ssleep10disordersapnoeainsomniaRestlesslegsyndromeSnoringSleeptipsandadvice11adviceExerciseregularlyRelaxmindAvoidcoffeineAvoidalcohol12Thanksforyourwatching!