What You Need to Know

Not all noise is equally disruptive to sleep, and interestingly, certain types of sound can actually help you fall asleep and stay asleep. White noise, pink noise, and brown noise are three different types of ambient sounds that have gained popularity as sleep aids. But what’s the difference between them, and which one might work best for your sleep? let’s break down the science.

To understand these different types of noise, it’s helpful to know a bit about sound frequencies. Sound exists across a spectrum of frequencies measured in hertz (Hz). Lower frequencies produce deeper, bass-like sounds, while higher frequencies create treble or high-pitched sounds. The different types of noise we’ll discuss differ in how their sound energy is distributed across these frequencies.

White noise contains all audible frequencies at equal intensity. Think of it as combining all sound frequencies together at the same volume. The term comes from physics, just as white light contains all visible light wavelengths, white noise contains all audible sound frequencies.

White noise sounds like TV static, a rushing sound, or a constant hiss. It’s relatively uniform and unchanging, which creates a consistent auditory environment.

White noise works well for sleep because it masks disruptive environmental sounds. By providing a consistent background noise, white noise can prevent sudden sounds (like traffic or a neighbor’s TV) from jolting you awake. The steady, unchanging nature makes it easier for your brain to “tune out” and ignore the background.

For some people, white noise can actually be irritating rather than soothing. The higher frequencies in white noise can feel harsh or tiring to the ear over long periods. Some sleepers report that white noise feels overstimulating rather than calming.