잠자는 자는 is composed of 잠자(다)+는(1) 자+는(2) 잠자(다) means "to sleep" 는(1) is a determiner particle 자 is means "man, person" 는(2) is a topic marker 잠자는 자 means "a person who is sleeping" 권리 위에 잠자는 자는 보호받지 못한다 means A person who is sleeping on rights cannot be protected.