大学英语10分钟presentationppt课件.ppt

1.Whats your daily rhythm?Doyouconsideryourselfamorningpersonoraneveningperson?Atwhattimeofdaydoyoufeelatyourbest?Consideringonlyyourownfeelingbestrhythm,ifyouwereentirelyfreetoplanyourdayatwhattimewouldyougetupandgotobed?2.Wehavetosleepbecauseitisessentialtomaintainingnormallevelsofcognitiveskills,suchasspeech,memory,innovativeandflexiblethinking.Why do we sleep?3.What would happen if we didnt sleep?Withcontinuedlackofsufficientsleep,thepartofthebrainthatcontrolslanguage,menmery,planningandsenseoftimeisseverelyaffected,practicallyshuttingdown.Sleepdeprivationnotonlyhasamajorimpactoncognitivefunctioning,butalsoonemotionalandphysicalhealth.Moreover,itllarousedisorderssuchassleepapnoeaandtheriskofobesity.4.What happens when we sleep?5.Non-REM sleep6.7.Thefirstrapideyemovement(REM)periodusuallybeginsabout70to90minutesafterwefallasleep.WehavearoundthreetofiveREMepisodesanight.REM sleep8.People like to sleep anywhere between 5 and 11 hours,with the average being 7.75 hours.How much sleep is required?SpeciesAverage total sleep time per dayPython巨蟒18hrsTiger15.8hrsCat12.1hrsChimpanzee黑猩猩9.7hrsSheep3.8hrsAfricanelephant3.3hrsGiraffe长颈鹿1.9hr9.A hard nights sleep10.Sleep tips and advice11.Thanks for your watching!12.