资源描述
单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,The science of sleep,1,W,hats your daily rhythm,?,Do you consider yourself a morning person or an evening person?,At what time of day do you feel at your best?,Considering only your own feeling best rhythm,if you were entirely free to plan your day at what time would you get up and go to bed?,2,We have to sleep because it is essential to maintaining normal levels of cognitive skills,such as speech,memory,innovative and flexible thinking.,Why do we sleep?,3,What would happen if we didnt sleep?,With continued lack of sufficient sleep,the part of the brain that controls language,menmery,planning and sense of time is severely affected,practically shutting down.,Sleep deprivation not only has a major impact on cognitive functioning,but also on emotional and physical health.Moreover,itll arouse disorders such as sleep apnoea and,the risk of obesity.,4,What happens when we sleep?,5,Non-REM,sleep,6,7,The first rapid eye movement (REM)period usually begins about 70 to 90 minutes after we fall asleep.,We have around three to five REM episodes a night.,REM sleep,8,People like to sleep anywhere between 5 and 11 hours,with the average being 7.75 hours.,How much sleep is required?,Species,Average total sleep time per day,Python,巨蟒,18 hrs,Tiger,15.8 hrs,Cat,12.1 hrs,Chimpanzee,黑猩猩,9.7 hrs,Sheep,3.8 hrs,African elephant,3.3 hrs,Giraffe,长颈鹿,1.9 hr,9,A hard nights sleep,10,Sleep tips and advice,11,Thanks for your watching!,12,
展开阅读全文