1. Sleep and Your life/ Stress and Sleep/ Sleep is Important
2. People who work late should try to give themselves a short break and do something restful before going to bed.
3. stress/ worry and (lack of) sleep are directly related
4. Seven hours is bout the average amount, though strangely enough, sleeping longer often gives you a headache instead of making you feel more refreshed.
5. 当你醒来时，你不但没有感到精力充沛（旺盛），反而疲惫不堪，难以面对新的一天。
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