She only sleeps for four hours a night.

她每天晚上只睡四个小时。

《牛津词典》

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While the adults go out at night for food, the young bats hang out in the cave for four or five weeks.

VOA: special.2009.12.07

On day four, The heavenly bodies that give off light by day or night are created.

在第四天，那些在白天或者晚上发光的天体被创造了。

耶鲁公开课 - 旧约导论课程节选

If you want to remember your dream by the way keep your dreams--keep a dream diary, very useful, but everybody dreams three to four times a night.

如果你想记得自己梦见什么,那就写一本梦境日记，这是非常有用的，每个人平均一晚作三四次梦。

耶鲁公开课 - 心理学导论课程节选

Friday night's show will be the final concert of a four-night run at the O2 Arena.

BBC: Justin Bieber to resume tour after scare

This week's four-night all-inclusive escape to Kanopi House, outside Port Antonio, is For Your Eyes Only.

BBC: Daily deal: Four nights in Jamaica

In a test search, GetGoing recommended a four-night escape to San Jose, Costa Rica as the most compelling destination with the most affordable flights.

BBC: Flip a coin, book a flight