You ought not to stay up so late. ✬

I often stay up all night. ✬

My brother would often stay up all night reading novels. ✬

Don't stay up late every night. ✬

You must not stay up late. ✬

The people in the next room stay up until all hours doing God knows what. ✬

I used to stay up late. ✬

Don't stay up late at night. ✬

It's not good to stay up late at night. ✬

You shouldn't stay up so late at night. ✬