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

Not until late at night did he come home.

I rarely, if ever, talk on the phone till late at night.

Don't sit up late at night.

You mustn't sit up late.

The young man had been sitting in the drawing room alone with the girl for a long time and it was getting late.

He made us work till late at night.

She is used to staying up late.

She stayed up late to finish sewing your dress.

Expecting time to find her child, she sat up till late at night.

They always sit up late doing their homework.

He sits up studying till late at night.

He often sits up late writing letters.

He was at work till late at night.

He was at work till late at night.

He sits up till late at night.

He works even late at night.

He would sometimes study late at night when young.

He practices playing the guitar far into the night.

He never goes out late at night.