Listen to いつか (眠りの歌) online. いつか (眠りの歌) is an Unknown language song and is sung by 睡眠導入. いつか (眠りの歌), from the album 睡眠導入音楽 - 療法音楽, was released in the year 2015. The duration of the song is 3:21. Download Unknown songs online from JioSaavn.