Instrumental Music for Sleep, Insomnia, Stress Relief, and Deep Sleep. 1 Hour Instrumental Music for Sleep, Insomnia, Stress Relief, and Deep Sleep. Instrumental Music for Sleep, Insomnia, Stress Relief, and Deep Sleep. 1 Hour Instrumental Music for Sleep, Insomnia, Stress Relief, and Deep Sleep. Instrumental Music for Sleep, Insomnia, Stress Relief, and Deep Sleep. 1 Hour Instrumental Music for Sleep, Insomnia, Stress Relief, and Deep Sleep.