Listen to Gregorian Chants For Sleep online. Gregorian Chants For Sleep is an Unknown language song and is sung by The Schola Cantorum of St. John XXIII Parish, Cantos Gregorianos and Monges da Abadia de Notre Dame. Gregorian Chants For Sleep, from the album Sanctuary of Sound | Divine Gregorian Harmonies for Deep Peace, was released in the year 2025. The duration of the song is 2:00. Download Unknown songs online from JioSaavn.