It's very late now—why don't you sleep over?

现在已经很晚了—为什么不就睡这儿呢？

《牛津词典》

During your exam period, you want your brain to work at its very best, so build in relaxation time before bed, avoid late night revision sessions and try to go to bed early so you get enough sleep.

在考试期间，你想让你的大脑处于最佳工作状态，所以在睡觉前安排放松时间，避免深夜复习，尽量早点睡觉，这样你就能得到足够的睡眠。

youdao

Just because you can sleep in the next morning shouldn't give you permission to go to bed late the night before.

正是因为你可以在第二天早上睡懒觉，所以不应该允许你自己在前一天晚上熬夜。

youdao

There is no worse feeling than waking up in the morning, rested from good night's sleep, and glancing at the clock, only to do a double-take: You're late!

CNN: Twelve amusing excuses for being late to work