This is the 17971st most frequent Korean word.
수면은
"수면은" means "sleep is" (subject marker used for "sleep").
In this sentence, '수면은' refers to 'sleep,' used as the topic of the sentence indicating its importance.
수면은 건강에 매우 중요한 요소입니다.
Sleep is a very important factor for health.
Here, '수면은' again represents 'sleep' as the main subject emphasizing its beneficial aspects towards mental health.
수면은 숙면을 통해 정신 안정에 도움을 줍니다.
Sleep aids in mental stability through sound sleeping.
In this sentence, '수면은' is used to discuss the necessity of sufficient sleeping for fatigue recovery.