Not surprisingly, the problem of daytime sleepiness usually starts at night.

不足为奇的是，日间困倦的问题通常在夜晚的时候就发生了。

youdao

Dr Alexandros said: "After one work week of mild sleep deprivation, two recovery nights were adequate in improving sleepiness but not performance."

亚历山大博士说：“在持续一周的轻度缺觉之后，两个晚上的恢复性睡眠虽然可以让人不再犯困，但是这并不能改善大脑的工作效能。”

youdao

If not is loving you, how met a night of depth not to have sleepiness.

如果不是爱着你，怎么会夜深了还没有睡意。

youdao

"There's not a way to legislate against sleepiness, " said Bruce Hamilton, manager of research and communications at the AAA Foundation for Traffic Safety, which instead focuses on public education campaigns and issuing brochures advising on the dangers.

WSJ: Drowsy driving remains an elusive highway dilemma

And experts say it's a problem that can't easily be solved by new laws because proving sleepiness behind the wheel is difficult, if not impossible.

WSJ: Drowsy driving remains an elusive highway dilemma