Research Reveals How Pink Noise Promotes Better Sleep

Research Reveals How Pink Noise Promotes Better Sleep

pink noiseHealth

We’ve all heard of white noise and how it helps people fall asleep, but now scientists have discovered how pink noise can lull us into a restful sleep as well. Unfortunately, insomnia and other sleep disorders have increased dramatically over the last decade, likely due to the prevalence of technology and a faster pace of living.

According to the Centers for Disease Control and Prevention, 30 percent of American adults don’t get the recommended amount of sleep each night.

Here are just a few health consequences of sleep deprivation:

  • Memory problems
  • Trouble concentrating and thinking clearly
  • Weakened immune system
  • Higher risk of developing diabetes
  • Risk of heart disease increases
  • Poor balance and coordination
  • High blood pressure
  • Risk of gaining weight and obesity
  • Accident risk increases
  • Anxiety and depression, along with other mental illnesses, can develop.
  • Disruption of hormone production

As you can see, a lack of sleep can affect many aspects of health, and today, people seem to have more sleep troubles than ever. Many doctors recommend white noise to help people get better sleep, but now, pink noise appears to show some promise as well.

Below, we’ll explain what pink noise is and how you can incorporate it into your sleep routine to get a restful night’s sleep.

pink noise

Research reveals how pink noise promotes better sleep:

First of all, what the heck is pink noise anyway? It operates on the lower range of frequencies compared to white noise, so this results in deeper sounds with more bass.

Humans can hear frequencies ranging from 20 hertz to 20,000 kHz. Frequency means the number of times per second a sound wave repeats itself, which determines the pitch of the sound. When we look at the scale of frequencies, 20 hertz is the lowest, so it will have a shallow pitch. On the opposite end, 20,000 kHz is the highest pitch and frequency we can hear.

Here are some common examples of pink noise that you probably hear at some point:

  • steady rainfall
  • the wind rustling through leaves
  • gentle ocean waves
  • low rumbling thunder
  • a low roaring waterfall
  • a fan on a low setting

Experts now believe that pink noise may even outperform white noise in its ability to help people get better sleep, but they still need to do more studies comparing the two. However, in one 2012 study, participants who listened to pink noise while sleeping got more deep sleep than those two slept without any noise. This outcome occurred because it slowed the brain waves of participants, which allowed them to fall into a deep sleep for a more extended period.

Pink noise may also positively impact memory. In a 2017 study, researchers played pink noise in sync with people’s delta brain waves (corresponding with deep sleep) and discovered that people improved on memory tests by 26% the following day. Also, a small study done in 2019 found that pink noise improved deep sleep and memory recall in people with mild dementia.

Plus, pink noise can mask other noise that can make it difficult to fall asleep, such as cars or loud music. Not to mention, hearing nature sounds will automatically lower your stress levels and put you into a much more relaxed state, which will help you fall asleep faster.


Here’s a description of the different types of noise, classified by colors:

Pink noise

To recap, pink noise is like white noise except much more deep-seated. It operates at lower frequencies and has a deep, rumbly sound.

White noise

White noise is comprised of all frequencies. It is equally distributed along the frequency scale, unlike pink noise, and creates an even, humming sound.

White noise examples include:

  • whirring fan
  • radio or television static
  • hissing radiator
  • humming air conditioner

Since white noise operates along with all frequencies equally, sleep therapists often recommend it for their patients to get better sleep since it will easily mask other sounds.

Brown noise

Brown noise is even more profound than pink noise, operating at lower frequencies.

Examples of brown noise include:

  • anything with a low roaring sound
  • strong waterfalls
  • thunder

Brown noise sounds similar to white noise to the human ear, but you can differentiate it because brown noise will have a deeper frequency. No studies exist on the effectiveness of brown noise for better sleep, but waterfalls and thunder can have a relaxing impact on some people.

Black noise

Black noise simply means a lack of sound. If you’ve ever been inside a sensory deprivation tank, you’ll know exactly what this feels like. We don’t typically get a chance to experience this in daily life, however, because even at night, we may hear the air conditioner or bugs outside. However, if you have a soundproof room, you might just get to experience the peacefulness of no sound at all.

If you frequently have trouble falling asleep at night and you don’t like noise at bedtime, we have some other suggestions for you. Experts have found that relaxation techniques such as breathing exercises can promote better sleep and lower the stress response.

Here are a few to try out if you frequently experience insomnia or other sleep problems:

relieve insomnia


Here’s how to do this breathing technique: Exhale for double the time you inhale on the same breath. This breathing exercise benefits both the sympathetic and parasympathetic nervous system. The sympathetic nervous system gets less stimulated during this breathing exercise, which increases activity in the parasympathetic nervous system. In turn, this slows the heart rate and relaxes the body.

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