The right sleep sound can help create the perfect environment to relax, alleviate stress, soothe a baby or pet, read, study, meditate, take a quick power nap, or get a full night of peaceful sleep. We have recorded our sound blend over a black screen, so that you will not be distracted by movement or light, and we've provided three straight hours with a gentle fade out at the end, so you will not be startled by a sudden stop.