Listen to Slumber online. Slumber is an Unknown language song and is sung by Sleep Sound Library. Slumber, from the album Deep Sleep Therapy - Zen Music for Lucid Dreaming, Fight Insomnia, Trouble Sleeping, Soothe Your Baby, New Age Music to Fall Asleep Quickly, Meditation Before Sleeping, was released in the year 2016. The duration of the song is 3:12. Download Unknown songs online from JioSaavn.