What is "sleep out"

Usage examples of "sleep out".

Well, well, let's lie down again and sleep out what little of the night there's left, and God will send us dawn and we shall be all right.

I rubbed my eyes again, not so much to get the sleep out of them as because there was something wrong about the place.

And he was still rubbing the smart of sleep out of his eyes as he fell in with his team.

The first class were allowed to sleep out of barracks, and to work for themselves on Saturday.