Sōseki Natsume said this quote

“ Daisuke was the sort of man who, once he was disturbed by something, no matter what, could not let go of it until he had pursued it to the utmost. Moreover, having the capacity to assess the folly of any given obsession, he was forced to be doubly conscious of it. Three of four years ago he had tackled the question of the process whereby his waking mind entered the realm of dreams. At night, when he had gotten under the covers and begun to doze off nicely, he would immediately think, this is it, this is how I fall asleep. No sooner had he thought of this than he was wide awake. When he had managed to doze off again, he would immediately think, here it is. Night after night, he was plagued by his curiosity and would repeat the same procedure two or three times. In the end, he became disgusted in spite of himself. He wanted somehow to escape his agony. Moreover, he was thoroughly impressed by the extent of his folly. To appeal to his conscious mind in order to apprehend his unconscious, and to try to recollect both at the same time was, as James had put it, analogous to lighting a candle to examine the dark, or stopping a top in order to study is movements; at that rate, it stood to reason that he would never again be able to sleep. He knew all this, but when night came, he still thought, now... ”