I bought a chamber pot for camping.

I bought two chamber pots for the bathroom.

The four o'clock flower is a very beautiful and fragrant flower.

The four o'clock flowers bloom in the garden during the summer.

I work day and night to complete the project.

In the dead of night, everyone is fast asleep.

I spent a sleepless night studying for the exam.

Sleep on it! Don't make important decisions when you're tired.

And that's that! (literally: And good night to the bucket!)

All cats are grey in the dark.