首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
What’s Happening While Sleeping? Sleep is very important to humans. The average person spends 220,000 hours of a lifetime s
What’s Happening While Sleeping? Sleep is very important to humans. The average person spends 220,000 hours of a lifetime s
admin
2010-09-10
43
问题
What’s Happening While Sleeping?
Sleep is very important to humans. The average person spends 220,000 hours of a lifetime sleeping. Until about thirty years ago, no one knew much about sleep. Then doctors and scientists began doing research in sleep laboratories. They have learned a great deal by studying people as they sleep, but there is still much they don’t understand.
Scientists study the body characteristics that change during sleep, such as body temperature, brain waves, blood pressure, breathing, and heartbeat. They also study rapid eye movement (REM). These scientists have learned that there is a kind of sleep with REM and another kind with no rapid eye movement (NREM).
NREM is divided into three stages. In stage one, when you start to go to sleep, you have a pleasant floating feeling. A sudden noise can wake you up. In stage two, you sleep more deeply, and a noise will probably not wake you. In stage three, which you reach in less than thirty minutes, the brain waves are less active and stretched out. Then, within another half hour, you reach REM sleep. This stage might last an hour and a half and is the time when you dream. For the rest of the night, REM and NREM alternate.
Body movement during sleep occurs just before the REM stage. The average person moves about thirty times during sleep each night.
Sleep is a biological need, but your brain never really sleeps. It is never actually blank. The things that were on your mind during the day are still there at night. They appear as dreams, which people have been discussing for centuries. At times people believed that dreams had magical powers or that they could tell the future.
Sometimes dreams are terrifying, but they are usually a collection of scattered, confused thoughts. If you dream about something that is worrying you, you may wake up exhausted, sweating, and with a rapid heartbeat. Dreams have positive effects on our lives. During a dream, the brain may concentrate on a problem and look for different solutions. Also, people who dream during a good night’ s sleep are more likely to remember newly learned skills. In other words, you learn better if you dream.
Researchers say that normal people may have four or five REM periods of dreaming a night. The first one may begin only a half hour after falling asleep. Each period of dreaming is a little longer, the last one lasting up to an hour. Dreams also become more intense as the night continues. Nightmares usually occur toward dawn.
People dream in color, but many don’ t remember the colors. Certain people can control some of their dreams. They make sure they have a happy ending. Some people get relief from bad dreams by writing them down and then changing the negative stories or thoughts into positive ones on the written paper. Then they study the paper before they go to sleep again.
Many people talk in their sleep, but it is usually just confusing half sentences. They might feel embarrassed when someone tells them they were talking in their sleep, but they probably didn’t tell any secrets.
Sleepwalking is most common among children. They usually grow out of it by the time they become adolescents. Children don’ t remember that they were walking in their sleep, and they don’ t usually wake up if the parent leads them back to bed.
Some people have the habit of grinding their teeth while they sleep. They wake up with a sore jaw or a headache, and they can also damage their teeth. Researchers don’ t know why people talk, walk, or grind their teeth while they are asleep.
There are lots of jokes about snoring, but it isn’ t really funny. People snore because they have trouble breathing while asleep. Some snorers have a condition called sleep apnea (呼吸暂停). They stop breathing up to thirty or forty times an hour because the throat muscles relax too much and block the airway. Then they breathe in some air and start snoring. This is a dangerous condition because, if the brain is without oxygen for 4 minutes, there will be permanent brain damage. Sleep apnea can also cause irregular heartbeat, a general lack of energy, and high blood pressure.
Most people need 7.5 to 8.5 hours of sleep a night, but this varies with individuals. Babies sleep eighteen hours, and old people need less sleep than younger people. If someone continually sleeps longer than normal for no apparent reason, there must be something physically or psychologically wrong.
You cannot save hours of sleep the way you save money in the bank. If you have only 5 hours of sleep for three nights, you don’ t need to sleep an extra 9 hours on the weekend. And it doesn’ t do any good to sleep extra hours ahead of time when you know you will have to stay up late.
What should you do if you have trouble sleeping? Lots of people take sleeping pills, but these are dangerous because they are habit-forming. If you take them for several weeks, it is hard to stop taking them.
Doctors say the best thing is to try to relax and to avoid bad habits. If you always go to bed and get up at about the same time, this sets a good and healthy rhythm in your life. Caffeine keeps people awake, so don’ t drink caffeine drinks in the evening. Smoking and alcohol can also keep you awake. You may have trouble sleeping if you have a heavy meal just before you go to bed. Eat earlier in the evening.
You may also have trouble steeping if you have a problem or something else on your mind. This is when you need to relax. As you lie in bed, tense the muscles in your feet and then relax them. Continue up the body, tensing and relaxing the muscles until you reach the head. Start with the feet again if you are still tense. Then remember some pleasant experience you had and relive it. If you are thinking about a problem or about something exciting that is going to happen the next day, get up and write about it. That will help take it off your mind. You can also get up and read or watch television. Be sure to choose a book or show that is not too exciting, or you may get so interested that you won’ t want to go to sleep even when you feel sleepy.
Parents are not supposed to lead their sleepwalking children back to bed because that will wake them up.
选项
A、Y
B、N
C、NG
答案
B
解析
这是关于梦游的表述,故可定位于第十段。根据第十段最后一句Children don’t remember that they were walking in their sleep,and they don’t usually wake up if the parent leads them back to bed 可判断本题为[N]。
转载请注明原文地址:https://jikaoti.com/ti/WUtFFFFM
0
大学英语四级
相关试题推荐
A、Thequalitiesapartnershouldhave.B、Theidealagetogetmarried.C、Theidealnumberofchildren.D、Favouritecolour.A
A、Yourbossisnotaroundyou.B、Theco-workersaroundyouaremakingpersonalphones.C、Youareoutsidetheworkplace.D、There
Itissimpleenoughtosaythatsincebookshaveclasses:fiction,biography,poetry—weshouldseparatethemandtakefromeach
A、Hehadn’ttakemedicines.B、Hehadn’twornenoughclothes.C、HewaitedforPeteroutsidehishouseforalongtime.D、Hecaugh
Anthropologyisthe【S1】______ofhumanbeingsascreaturesofsociety.Itfastensitsattentionuponthosephysicalcharacteristi
Nowadaysitisunderstoodthatadiet,whichcontainsnothingharmfulmayyetresultinseriousdiseaseifcertainimportantde
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhomh
随机试题
女性,37岁,1年前诊断为再生障碍性贫血,经治疗好转。2个月来乏力、头晕加重,间有酱油色尿。查:血红蛋白60g/L,白细胞4×109/L,血小板60×109/L,网织红细胞84%,骨髓增生活跃,细胞外铁阴性。下述治疗措施对上述患者的症状无减轻作用的是
若组成蛋白质的氨基酸平均相对分子质量是130,那么一个由4条肽链,共280个氨基酸所组成的蛋白质的平均相对分子质量是
具有乳化作用的基质油性润滑剂
某10kV变电所,10kV系统中性点不接地,请回答下列问题:距变电所220/380V线路低压配出点300m有三相平衡用电设备,负载电流261A,功率因数cosφ=1,按允许载流量设计选用导体标称截面95mm2的电缆。为校验允许电压降的设计要求,计算线路
某机场原有一条长度为3200m的跑道,南北方向,双向分别配置I类仪表着陆系统,分别为18ILS和36ILS。现多架飞机机组人员反映南下滑台下滑道信号抖动不稳,为此进行了飞行校验。根据校验数据,该仪表着陆系统被确定为限用,原因是用于南下滑台保护区的围界为铁丝
业主不得违反法律、法规以及管理规约,将住宅改变为经营性用房。业主将住宅改变为经营性用房的,除遵守法律法规以及管理规约外,应当经()同意。
首个具有法律约束力的国际公约,并涵盖所有人权范畴,保障儿童在公民、经济、政治、文化和社会中的权利的是()。
为了验证叶片在光合作用和呼吸作用过程中有气体的产生和消耗,请用所提供的实验材料与用具,在给出的实验步骤的基础上,继续完成实验步骤的设计,并对实验结果进行分析。实验材料与用具:烟草幼苗一株、试管两支、蒸馏水、NaHCO2稀溶液(为光合作用
已知某ARM处理器内部看门狗定时器(wDT)控制寄存器地址为0x40040000,将这个地址装入。R0后,要写WDT的值(在R1中)来使能看门狗定时器,以下正确的指令是()。
设有如下代码:x=1dox=x+2loopuntil【】运行程序,要求循环体执行三次后结束循环,在空白处填入适当语句。
最新回复
(
0
)