A third of the population of the UK and over 40percent in the US regularly sleep less than five hours a night, so itis not a trivial problem.

三分之一的英国人以及超过40%的美国人每晚的睡眠时间常常达不到五个小时，所以这个问题不可小视。

youdao

A third of the population of the UK and over 40 percent in the US regularly sleep less than five hours a night, so itis not a trivial problem.

三分之一的英国人以及超过40%的美国人每晚的睡眠时间常常达不到五个小时，所以这个问题不可小视。

youdao

A third of the population of the UK and over 40 percent in the US regularly sleep less than five hours a night, so it is not a trivial problem

三分之一的英国人以及超过40%的美国人每晚的睡眠时间常常达不到五个小时，所以这个问题不可小视。

youdao

Confronted with one son who wanted to make a film about how tests were ruining his high school, and another son whose stress over the high-stakes tests led him to scratch his legs during his sleep, Michele decided to take the problem seriously.

FORBES: Opting-Out of No Child Left Behind