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[audioFiles]2013w28/audio_ezfj_028_20137[/audioFiles]

游客2023-11-12  19
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答案                             Sleep
    Why is it so difficult to fall asleep when you are overtired? / There is no one answer that applies to every individual. / It is possible to feel "tired" physically / and still be unable to fall asleep, / because while your body is 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 three consecutive nights, / you begin to owe "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 tried, / 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.
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