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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. 使過度疲勞
apply to將……應用於
exhausted adj.耗盡的，疲憊的.
complicate v.(使)變複雜
function vi.(器官等)活動，執行
consecutive adj.連續的，聯貫的
accrue vi.自然增加，產生
vicious adj.惡的，不道德的
vicious cycle 惡性迴圈
a vicious companion一個壞朋友
a vicious textbook 錯誤百出的教科書
vicious criticism惡意的批評
viciou reasonng錯誤的推理
a vicious headache 劇烈的頭痛幻
stimulate v.刺激，激勵
substitute for代替……，替換……
