Listen to Rainbow (Restful Sleep) online. Rainbow (Restful Sleep) is an Instrumental language song and is sung by Pet Care Music Therapy. Rainbow (Restful Sleep), from the album Zen Pet Spa - Relaxing Music for Nail Trimming, Stressful Situations, Separation Anxiety, was released in the year 2018. The duration of the song is 5:12. Download Instrumental songs online from JioSaavn.