There would be many expressions. The followings are good and somewhat literal translation. informal : "잘 잤어?" "잘 잤니?" formal : "잘 잤어요?" honorific : "잘 주무셨어요?" "편히 주무셨습니까?" etc.

잘 잤어? It's pretty simple:)

당신은 잠을 잘 않았다 ? is it correct ?