Fortunate Sleep - Cat Scratchism Mix is a song from Silent Hill 4: The Room. The song is track 5 of the Limited Edition soundtrack and was composed by Akira Yamaoka.
It plays in the "Sōjō (G Sharp)" segment of the audio drama "Inescapable Rain in Yoshiwara", that was included in the Japanese release of the game's soundtrack. It starts at 0:40 of the aforementioned segment.