This is the 17972nd most frequent Korean word.
수면장애
"수면장애" means "sleep disorder" in English.
"수면장애" is explicitly mentioned as causing an inability to rest sufficiently.
수면장애 때문에 충분한 휴식을 취하지 못했어요.
Due to sleep disorders, I couldn't get enough rest.
"수면장애" is described as an issue someone is actively attempting to overcome.
그는 수면장애를 극복하려고 노력하고 있습니다.
He is trying to overcome his sleep disorder.
"수면장애" is referred to broadly as a condition requiring professional consultation.