有时候人们在非常困倦的时候几乎在任何地方都会睡着。例如，夜间下班坐公车或火车回 家的人很多都会睡着。在一些课堂上，一个学生打鼾声非常大，以致教授不得不让另一个学生把他叫醒。最糟的是开车时睡觉。警方的报道充斥着因驾驶员打瞌睡而撞到了其他东西引起的交通事故。

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.