参考答案：现在人们的睡眠时间相比一个世纪以前减少了20%。2010年一份有1000位美国人参与的调查显示，36%的美国人在开车时会昏昏欲睡或者入睡，29%的人在工作时会睡意很重。

解析：
People now sleep about 20% less than they did a century ago. One 2010 poll of 1, 000 Americans found 36% are drowsy or fall asleep when they are driving, and 29% become very sleepy at work. (36 words)