We have a harder time falling asleep Tuesday night.

周二晚上更难以入眠。

We don't spend much time tossing and turning in bed -- just a couple minutes a day on average. But that time peaks on Tuesdays, not coincidentally the same day we work the hardest. Sleep comes easiest on Friday nights, when we rest easy knowing the weekend is ahead. But sleeplessness creeps back up as we head into Monday.

美国人没有花太多时间在床上辗转反侧——平均一天只有几分钟。但是星期二失眠时间最长。星期五的晚上最容易入眠，因为我们知道第二天就是周末。但是到了星期一，又会再次失眠。