The big three in sleep sounds are white noise, brown noise, and pink noise, but there are many other noise types, including purple noise, gray noise, and even black noise (a.k.a. good ol ...

but a noise machine can generate a steady color noise that helps block out these unwanted sounds. White noise is the best known, and machines that make it have been on the market for decades.

from gray noise to pink noise, that promote relaxation, and so many sound machines on the market come with dozens of sounds ...