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1WHAT’SYOURDAILYRHYTHM?•Doyouconsideryourselfamorningpersonoraneveningperson?•Atwhattimeofdaydoyoufeelatyourbest?•Consideringonlyyourownfeelingbestrhythm,ifyouwereentirelyfreetoplanyourday—atwhattimewouldyougetupandgotobed?2•Wehavetosleepbecauseitisessentialtomaintainingnormallevelsofcognitiveskills,suchasspeech,memory,innovativeandflexiblethinking.Whydowesleep?3WHATWOULDHAPPENIFWEDIDN'TSLEEP?4•Withcontinuedlackofsufficientsleep,thepartofthebrainthatcontrolslanguage,menmery,planningandsenseoftimeisseverelyaffected,practicallyshuttingdown.•Sleepdeprivationnotonlyhasamajorimpactoncognitivefunctioning,butalsoonemotionalandphysicalhealth.Moreover,it’llarousedisorderssuchassleepapnoeaandtheriskofobesity.Whathappenswhenwesleep?56NON-REMSLEEP7•Thefirstrapideyemovement(REM)periodusuallybeginsabout70to90minutesafterwefallasleep.•WehavearoundthreetofiveREMepisodesanight.REMSLEEP8Peopleliketosleepanywherebetween5and11hours,withtheaveragebeing7.75hours.HOWMUCHSLEEPISREQUIRED?9SpeciesAveragetotalsleeptimeperdayPython巨蟒18hrsTiger15.8hrsCat12.1hrsChimpanzee黑猩猩9.7hrsSheep3.8hrsAfricanelephant3.3hrsGiraffe长颈鹿1.9hrAHARDNIGHT'SSLEEP10disordersapnoeainsomniaRestlesslegsyndromeSnoringSLEEPTIPSANDADVICE11adviceExerciseregularlyRelaxmindAvoidcoffeineAvoidalcohol12Thanksforyourwatching!