2017年英语专四听力听写考试材料

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　　Sleep

Why is it so difficult to fall asleep when you are overtired? There is no one answer that applied to every individual. It is possible to feel "tired" physically and still be unable to fall asleep, because while your bocdy may be exhausted, you do not feel sleepy. It is not so easy to simply "turn off".

Lack of sleep complicates matters even more. Experts say adults need at least seven to eight hours of sleep a night to function properly. When you get less sleep than that on consecutive three nights, you begin to accrue four "sleep debt". As sleep debt increases your body experiences a stress response. Now a vicious cycle has been created: You experience the feeling of being more and more tired, but your body is increasingly stimulated. "Power sleeping" for more hours on weekends is only a temporary solution. There is no substitute for getting a good night's sleep on a regular basis. (158 words)

　　Useful Words and Expressions:

ovcrtire vt. 使过度疲劳

apply to将……应用于

exhausted adj.耗尽的，疲惫的.

complicate v.(使)变复杂

function vi.(器官等)活动，运行

consecutive adj.连续的，联贯的

accrue vi.自然增加，产生

vicious adj.恶的，不道德的

vicious cycle 恶性循环

a vicious companion一个坏朋友

a vicious textbook 错误百出的教科书

vicious criticism恶意的批评

viciou reasonng错误的推理

a vicious headache 剧烈的头痛幻

stimulate v.刺激，激励

substitute for代替……，替换……