Maybe you even use pink noise, like the gentle crash of ocean waves against the shore, to get to sleep. But there's another frequency to try: brown noise, also called Brownian noise or red noise ...

Pink noise reduces the intensity of higher frequencies of white noise, producing a softer, lower-pitched sound similar to rain or ocean waves.

PINK NOISE Pink noise, like ocean waves or steady rain without thunder and wind, is softer in high-frequency tones and ...