Why Are There Colored Noises And How Do They Impact Your Sleep?

You are probably familiar with the term "white noise" and know it refers to an often gentle, static sound. But have you heard of the other sound colors like pink, brown or green?

As many of us explore apps and technologies to monitor our health, lower our stress and improve the quality of our sleep, you may have come across soundscapes and noises that claim to help you relax and get better sleep.

We dive into the different colors of noise, what they mean and which might be the best to help you sleep.

• White Noise: The Sleep Foundation describes white noise and the layering of multiple sound frequencies at the same time. Similar to how the white light is produced by equally containing every wavelength on the visible spectrum, white noise equally contains all frequencies across the audible sound spectrum. White noise, which can be the whirring of a fan or the static of a television, can often be helpful in blocking out other sounds that may keep you awake at night, which is great at helping you get to sleep and stay asleep. However, white noise can seem to "hiss" and be harsh or even annoying for some.
• Pink Noise: Technically, pink noise is what you get when the sound's power increases in lower frequencies and decreases at high frequencies. The ear usually interprets pink noise as being pleasant, balanced and more calming than white noise, which has more power in the higher frequencies. Most often, pink noise can sound similar to wind or being underwater. Also, distant traffic noises are often similar to pink noise.
• Brown Noise: If you enjoy the sound of distant rumbling thunder, you may be a fan of brown noise. This color of sound is described as having a deep pitch with significantly less power as frequencies become higher. Similar to pink noise, brown noise can be very pleasant and calming, promoting relaxation which generally improves the quality of sleep.
• Green Noise: Similar to white noise, green noise describes when there is more power in the mid-frequencies compared to higher and lower frequencies. Green noise is often compared to a waterfall or a stream, avoiding the hissing sound of white noise by giving less power to higher frequencies while also seeming fuller than pink or brown noise.

Other noises like nature or urban sounds may also help muffle outside noises, promote relaxation and even help you concentrate.

What Is The Best Noise For Sleep?

Unfortunately, there is no definitive best noise for the best sleep.

There is limited scientific research on how the different colors of noise impact sleep, but some researchers believe white noise may be the least helpful for good sleep because of its higher frequencies.

If you are considering trying different colored noises to help you sleep, you can experiment with each to learn what is best for you.

It's important you also make sure you're doing everything else to make sure your routine and bedroom conditions are you conducive to great sleep. We have some tips on popular sleep hacks that may help.

If you are having trouble getting to sleep or staying asleep, consider speaking with your primary care provider who may refer you to a sleep specialist, like those at EvergreenHealth Sleep Services.