Difference between to sleep and to sleep in Korean
잠자다·주무시다

잠자다to sleep
"To sleep" means to rest with your eyes closed, usually at night or during a nap. In Korean, 잠자다 is used when someone goes to sleep or is sleeping. You can use it for people and animals in everyday situations.

주무시다to sleep
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.
The difference
to sleep (잠자다) and to sleep (주무시다) are nearby Korean vocabulary items learners often meet together. Use “to sleep” when "To sleep" means to rest with your eyes closed, usually at night or during a nap. In Korean, 잠자다 is used when someone goes to sleep or is… Use “to sleep” when 주무시다 means "to sleep," but it is the respectful word for talking about another person sleeping. Use it for older people, guests, teachers…