Listen to Let Them Sleep online. Let Them Sleep is an Instrumental language song and is sung by Rainforest Music Lullabies Ensemble. Let Them Sleep, from the album Sleep Relief 2021 - Soothing Music to Relax Muscles and Get a Great Night's Sleep, was released in the year 2021. The duration of the song is 5:39. Download Instrumental songs online from JioSaavn.