Listen to Sleep Relaxation online. Sleep Relaxation is an Unknown language song and is sung by Serenity Relax. Sleep Relaxation, from the album Yoga Fitness Zen Chillout Lounge Music - Exercices, Poses, Meditate, Relax, Breathe, was released in the year 2015. The duration of the song is 3:01. Download Unknown songs online from JioSaavn.