When to use to sleep in Korean
Korean: 주무시다[ ju-mu-si-da ]

When to use it
주무시다 means "to sleep," but it is the respectful word for talking about another person sleeping. Use it for older people, guests, teachers, or customers. It is more polite than the basic word for sleep.
Example sentences
할머니는 방에서 주무세요.
Grandma is sleeping in the room.
아버지는 지금 소파에서 주무세요.
My father is sleeping on the sofa now.
선생님, 어제 잘 주무셨어요?
Teacher, did you sleep well yesterday?
할아버지는 기차에서 조금 주무셨어요.
Grandfather slept a little on the train.
손님, 오늘은 이 방에서 주무세요.
Sir/Ma’am, please sleep in this room tonight.
어머니는 아직 안 주무셨어요.
Mother has not gone to sleep yet.