很多时候人们由于太累而几乎能在任何场合睡着。例如，许多人在晚上下班回家的公交车或者火车上睡着了。在有些教室里，一个学生打呼声太大以至于教授要让旁边的人把他叫醒。最糟糕的是当他在开车的时候睡着，警察报告显示，许多交通事故的发生是由于人们走神了然后撞向其他的东

There are times when people are so tired that they fall asleep almost anywhere. For example, there is a lot of sleeping on the bus or train on the way home from work in the evenings. In some classes, a student will Start snoring so loudly that the professor has to ask another student to shake the sleeper awake. The worst time to fall asleep is when driving a car. Police reports are full of traffic accidents that occur when people doze off and bump into something else.