She was a person accustomed to having eight hours' sleep a night.

她是那种习惯每晚睡八个小时的人。

《牛津词典》

Eight hours of sleep a night is necessary for all of us.

每晚八小时的睡眠对我们所有人都是必要的。

youdao

According to the Ministry of Education, primary school students should get at least 10 hours of sleep a night.

根据教育部的规定，小学生每晚应至少有10个小时的睡眠时间。

youdao

Adults should try to get seven to eight hours of sleep a night.

VOA: special.2010.06.09

How many people here on average-- from the beginning of the semester until now get on average more than eight hours of sleep a night?

这里平均有多少人-,从开学到现在,平均每晚睡超过八小时的？

耶鲁公开课 - 心理学导论课程节选

because I sleep in a different place every night, so yeah!

因为我每晚都在不同的地方睡觉，好啊！

选择美术的原因 - SpeakingMax英语口语达人

Fu, who describes herself--inaccurately--as "pretty relaxed, " claims she usually gets seven hours of sleep a night.

FORBES: Top U.S. Colleges

Fu, who describes herself--inaccurately-- as "pretty relaxed, " claims she usually gets seven hours of sleep a night.

FORBES: Magazine Article

According to the National Institutes of Health, most adults need seven to eight hours of sleep a night.

CNN: Caffeinated moms drink up to keep up