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            • 1． Is there anyone around you who is a short sleeper？ A short sleeper is a person who (1) sleeps less than the average member of his age group． His nightly length of sleep is five hours or less． The short sleeper feels good after waking up．
              The limited time asleep is (2) to a short sleeper． It is not a behaviour of reducing the amount of sleep or (3) to sleep． This low amount of sleep is very stable （稳定） from night to night． It is also the same on weekends and holidays．
              A pattern （模式） of short sleep often begins as a child or young adult． Once it begins， the pattern continues through the years． This pattern of short sleep may cause others to be (4) ． Family members or friends may think that something is wrong．
              Someone may tell a short sleeper to use medicine to help him sleep more． This will make him get sleep that he really does not need． It will bring him more problems． A short sleeper will also have trouble with his family and friends if he expects others to (5) his pattern of sleep． Most people will not be able to do well with only five hours of sleep each night．
              Short sleeping can be confused with insomnia （失眠症）． Both (6) can cause a person to get a small amount of sleep at night． A person with insomnia has a hard time falling asleep or staying asleep． The overall quality of his sleep may be very poor． This can cause him to be sleepy during the day． The short sleeper does not have any of these problems．

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