2. 外语
  3. Sleep is an important part of our lives. We spend out one-third of our lives sleeping. For millions of people, 【C1】______ , gett

Sleep is an important part of our lives. We spend out one-third of our lives sleeping. For millions of people, 【C1】______ , gett

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问题      Sleep is an important part of our lives. We spend out one-third of our lives sleeping. For millions of people, 【C1】______ , getting enough sleep is a continuing struggle. A recent study found that thirty-five percent of Americans have 【C2】______ going to sleep or staying asleep. The problem is called insomnia. Insomnia exists 【C3】______ a person is not able to get the 【C4】______ of sleep needed to operate effectively. Insomnia is not 【C5】______ in numbers of hours of sleep. This is because different people need 【C6】______ amounts of sleep to feel rested. The most common problems 【C7】______ from insomnia are sleepiness and trouble in  completing work. Other problems are emotional disorders and difficulty 【C8】______ thinking. The treatments for 【C9】______ were discussed at a recent meeting of the Association of Professional Sleep Societies. The group’s sleep experts say there are three kinds of insomnia. One 【C10】______ is called transient insomnia. It 【C11】______ just a few days. It is a result of moderate tension. The tension can be caused by a long airplane flight or a brief stay in a hospital. 【C12】______ kind is called short-term insomnia. It lasts several weeks and results from more 【C13】______ tension. The tension may be caused by problems at work or at home, a major sickness or the death of a loved one. The third kind of insomnia is called 【C14】______ . It lasts longer than several weeks. It often is a sign of severe physical or 【C15】______ problems. Sleep experts say anyone with long-term insomnia should be examined so the cause can be found and treated.
      Many things we eat or drink can affect our 【C16】______ . Drinks containing alcohol or caffeine can block sleep. 【C17】______ can some medicines. Other causes of insomnia include breathing problems or sudden, uncontrolled body movements during sleep. Because insomnia has so many causes, not all treatments are 【C18】______ for everyone. But experts have offered some simple ideas that work for most people. If 【C19】______ to sleep, they say, get up and go to another room, if possible. Stay up until you are really 【C20】______ , then return to bed. Get sip at the same time every day. Do not exercise just before going to bed. And, do not worry about past problems or future plans.
【C2】______
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答案diffficulty/trouble
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