Meanings

sleepThe state of taking a rest for a period of time with one's eyes closed and mental activities suspended.
sleep(figurative) The state of not realizing and being aware of something.

Examples from Lessons (3)

친구 하고 잠을 자요.I am sleeping with a friend.Read the Lesson

어제 긴장해서 잠을 잘 못 잤나요?Did you not sleep well last night because you were nervous?Read the Lesson

어제 너무 긴장해서 잠을 못 잤어요.I was so nervous yesterday that I couldn't sleep.Read the Lesson