I have used this song for 2x repeatedly, say 10min.+10.mins, at 12h when I was sleepy on the work. Was expecting a wake up effect, which appeared immediately, and waked me up relatively for +30% more awaken and I've gained some memory concetration for relatively +20% - 30% more.
저는 이 노래를 10분+10분씩 두 번 반복해서 들었어요. 12시쯤 일하다가 졸릴 때 들었어요. 깨는 효과가 있을 거라고 기대했는데, 효과가 바로 나타나서 비교적 30% 더 깨어났고, 기억력도 20~30% 더 향상되었습니다.