People awake, pharyngeal tissue is tense, it will not block breathing; and to sleep later, some people relax or because of throat tissue hypertrophy, part of the airway obstruction, snoring occurs; if the airway is completely blocked , Air can not enter the lungs, can cause apnea. In the case of a serious shortage of oxygen, the brain will wake up to just a short body to tighten the throat of the degree of airway obstruction to lift, with a loud breathing, breathing returned to normal. So the cycle, breathing becomes shallow, fragmented sleep, so waking up the morning after the body tired. Over time, the body often hypoxia, lung, heart and other organs will be damaged.
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Work, family and other commitments rouse people early, while computers, TV and other electronic media keep people awake late at night.
工作、家庭和其它方面的义务会很早的把人们唤醒，而电脑、电视和其它电子媒体会使人们在很晚还没有入睡。
Initially, colony vessels like the Dreamer kept three or four people awake to handle backup problems, but the monotony put them at each other's throats.
最初，像“梦想者号”这样 的殖民飞船都会留下三到四个醒着的船员，以便处理各种后备问题，但是单调的旅程让他们丢掉了大半条性命。
For example, while caffeine keeps people awake in part by blocking adenosine, a brain chemical that brings on sleep, the chlorogenic acid in coffee keeps adenosine circulating in the brain longer.
举例来说，尽管咖啡因通过阻碍有助睡眠的大脑化合物腺甘从而让人们保持清醒，但咖啡中的绿原酸让腺甘苷在大脑中循环的时间延长了。
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