Last August,a study in the journal Sleep Medicine said children who go to bed after nine o'clock took longer to fall asleep and slept less.

VOA: special.2010.06.09

But if you're the type who prefers to be bed by midnight, that's quite okay too; there'll be plenty of time to work on the project.

但是，如果你习惯半夜睡觉，也同样可以,你还有足够的时间完成这个项目。

哈佛公开课 - 计算机科学课程节选

"Right now at a time when there are more hungry people in the world than ever before, there is less food aid than we have seen in living memory and this is extremely alarming to the World Food Program because we are the ones on the front lines trying to help the most hungry out of the one billion people who are going to bed every night without enough food."

VOA: standard.2009.10.14