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Night Light

What Is Brown Noise? A Deeper Sound, With Evidence in Context

Updated

Brown noise, also called Brownian noise, puts more emphasis on low frequencies. It usually sounds deeper and less hissy than white noise. That makes it an interesting sound to compare if you prefer a low rumble to a brighter background.

What does brown noise sound like?

Pay attention to the low, rounded body of the sound. Your speaker can change how much of that bass you hear, so a phone and a larger speaker may give different impressions of the same recording.

Brown Noise

Sample · 15 seconds
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35%

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A 15-second preview of the sound in the app. No automatic repeat.

What do the frequencies mean?

The ideal brown-noise spectrum follows a 1/f² model: power falls more steeply towards high frequencies than in pink noise. The name describes a frequency balance, not a single bass note. Lower pitch is also different from lower volume.

The acoustic description explains the noise model; the sample is Night Light’s own version, not a laboratory reference signal.

Brown noise for sleep: claims and evidence

Claim What was actually studied What we can conclude
It has more low-frequency emphasis. That is a property of the acoustic model, with a steeper high-frequency falloff than pink noise. [1] A deeper texture is well defined; a health benefit does not follow from it.
Brown noise is proven to help ADHD. A 2024 meta-analysis found small task-performance benefits from white/pink noise in some participants with ADHD or elevated symptoms; it found no brown-noise studies. [3] Those results do not establish a brown-noise benefit or an ADHD treatment.
It is the best color for sleeping. The reviewed evidence does not establish brown noise as the best color for everyone. [4] Personal preference and a demonstrated improvement in sleep are different questions.

If you enjoy a bassier background, brown noise is worth listening to as a sound preference. You do not need to accept promises about concentration or sleep to decide whether you like its texture.

A simple way to listen

  1. Start with a low, comfortable volume. Listen to the texture, rather than making it loud enough to cover everything.
  2. After the sample ends, leave a short pause. Notice whether you prefer this background sound or the quiet.
  3. If you keep listening in the app, choose the duration that suits you and use the timer when you want it to stop.

A common question

Is brown noise just white noise with the volume turned down?

No. Turning down a recording lowers its overall level. Changing the color changes the relative balance of frequencies. The lower-pitched character of brown noise is why the two can feel different even at a comfortable listening level.

Compare white, pink, brown and green noise →

Sources and further reading

  1. MathWorks · Colored Noise
  2. Audacity · Noise
  3. Nigg et al. (2024) · Noise and attention tasks
  4. Riedy et al. (2021) · Noise as a sleep aid

Research reviewed on October 25, 2026. Results depend on the sound, volume, setting and people studied; the cited studies did not test Night Light.