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There are times when people are so tired that they fall asleep almost anywhere. We can see there is a lot of sleeping on the bus or train on the way home from work in the evenings. A man will be reading the newspaper, and seconds later it appears as if he is trying to eat it. Or he will fall asleep on the shoulder of the stranger sitting next to him. Another place where unplanned short sleep goes on is in the lecture hall where a student will start snoring so loudly that the professor has to ask another student to shake the sleeper awake. A more embarrassing situation occurs when a student starts falling into sleep and the weight of the head pushes the arm off the desk, and the movement carries the rest of the body along. The student wakes up on the floor with no memory of getting there. The worst time to fall asleep is when driving. Police reports are full of accidents that occur when people fall into sleep and go off the road. If the drivers are lucky, they are not seriously hurt. One woman's car, for example, went into the river. She woke up in four feet of water and thought it was raining. When people are really tired,nothing will stop them from falling asleep-----no matter where they are.

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Hi wangqh2696122,

Think about what happens when you fall asleep while you are sitting: your head will likely fall forward. The picture the author is trying to create is that of someone whose head has fallen forward (as a result of falling asleep) right onto the newspaper. Since the person's mouth could end up directly on the newspaper in this situation, it may tend to look as though the person is attempting to eat the newspaper.
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His face dropped into the newspaper when he fell asleep.