Study authors say people in the United States are losing sleep, with Americans sleeping one and a half to two hours less a night than we did 40 years ago.
研究的发起者说美国的人们在失去睡眠，现在的美国人比40年前的少睡一个半钟到2个钟。
"Twenty years ago it took a day-and-a-half," she says, "two years ago it took four hours on the superhighway."
二十年前要花一天半的时间，她说，两年前只需高速公路上四个小时。
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