Brown Noise vs White Noise: Which Is Better for Sleep, ADHD & Focus?

Both are continuous, unstructured sound. Both mask disruptions. The difference is where the energy sits, and that single fact determines which one suits you.

Short version: brown noise for focus, ADHD, and falling asleep with a busy mind. White noise for masking unpredictable sounds and for babies. If you're not sure and have no specific reason to choose otherwise, start with brown.

Play brown noise → · Play white noise →

The frequency difference

White noise is flat. Equal power at every frequency from 20Hz to 20,000Hz, by definition. Because there are far more high frequencies than low ones in that range, and because human hearing is most sensitive in the upper-middle, white noise reads as bright and slightly harsh. It's the sound of untuned static or a fan on high.

Brown noise drops 6dB per octave as frequency rises. That's a steep slope — twice as steep as pink noise. The practical result is that nearly all the audible energy sits below 500Hz, producing a deep rumble with almost no top end. It sounds like a waterfall, a large engine room, or the inside of an aircraft cabin.

| Frequency band | White noise | Brown noise | |---|---|---| | 20–100Hz (deep bass) | Moderate | Very high | | 100–500Hz (bass) | Moderate | High | | 500Hz–2kHz (mid) | Moderate | Moderate | | 2kHz–8kHz (upper mid) | Moderate | Low | | 8kHz–20kHz (treble) | Moderate | Very low |

Everything below follows from that table.

For ADHD and focus

Brown noise, clearly.

Brown noise became a fixture of ADHD communities from around 2022, and the preference has held. The mechanism most people point to is arousal regulation: ADHD is frequently associated with under-arousal, which shows up behaviourally as distractibility — the brain seeking stimulation. Continuous low-frequency sound appears to provide enough baseline input that the seeking stops.

The research is still thin on brown noise specifically. A 2024 meta-analysis on noise and ADHD found modest positive effects on attention tasks, concentrated in under-aroused individuals — which matches the community reports. It also found that roughly a third of participants performed worse with noise, which also matches.

White noise works for some people with ADHD, but it's the less common preference. Its brightness tends to register as something to notice rather than something to settle into.

If you're testing this: run two weeks with brown noise and track actual output, not how it felt. A third of people should find it doesn't help, and it's better to know than to persist.

Brown noise for ADHD → · Best noise for focus →

For falling asleep

Brown noise, for the specific failure where you're tired but your mind won't stop.

The density of low-frequency sound gives attention somewhere passive to rest, which interrupts rumination without offering anything interesting enough to keep you awake. People describe it as a mental blanket, and it's the most consistently reported benefit of brown noise after focus.

White noise can work here too, but it carries a subtle disadvantage: high-frequency sound activates the brain's alertness response. It's an old survival wiring — sharp, high sounds meant something needed attention. For some people white noise masks perfectly well and still leaves them wired.

Does brown noise help you sleep? →

For staying asleep

Depends on what's waking you.

If the disturbances are low-frequency — traffic, a snoring partner, footsteps upstairs, building machinery, a neighbour's bass — brown noise is substantially better. It's the only common noise color with enough energy down there to actually cover them.

If the disturbances are varied and unpredictable — a bit of everything, sounds you can't characterise — white noise's even coverage is more reliable. It handles high-pitched pipes and mid-range voices as well as low rumble.

If the disturbances are specifically high-pitched — birdsong at dawn, coil whine, squeaking — white noise wins outright, and blue noise is worth considering as a more targeted option.

For babies

White noise, and it isn't close in terms of evidence.

White noise has decades of research behind it for infant sleep, it's used in neonatal units, and it's what paediatric guidance is built on. The usual explanation is that it resembles the in-utero sound environment, which is considerably louder than people expect — roughly 70–85dB of constant broadband sound from blood flow and digestion.

Brown noise does work for some babies, particularly those who settle well in cars and prams. But if you're starting from scratch with a newborn, white noise is the sensible default, and the safety guidance is identical either way: below 50dB, at least 200cm from the crib.

White noise for babies → · Brown noise for babies →

For tinnitus

White noise, though neither is optimal.

Tinnitus most commonly presents as high-pitched ringing, usually somewhere in the 4–8kHz range. Masking works by overlapping the frequency of the sound being masked — which means brown noise, with almost no energy up there, does very little.

White noise has the coverage. But because it spreads energy across the entire spectrum, much of its output goes into frequencies that aren't helping. Violet noise concentrates energy exactly where high-frequency tinnitus lives and is more efficient, at the cost of being harsher to listen to.

Brown noise only helps the minority whose tinnitus presents as a low hum rather than a ring.

White noise for tinnitus →

For long sessions

Brown noise, for comfort.

Ear fatigue over many hours is driven mostly by high-frequency content. White noise has plenty and starts to feel tiring after two or three hours for most people. Brown noise has very little and is comfortable to run all day.

If you want to go further in that direction, grey noise and green noise are gentler still.

The summary

| Use case | Winner | |---|---| | ADHD focus | Brown | | Deep work | Brown | | Falling asleep / racing thoughts | Brown | | Blocking traffic or snoring | Brown | | Light sleepers, varied disruptions | White | | Blocking office chatter | White | | Baby sleep | White | | High-frequency tinnitus | White | | Blocking birdsong or high-pitched sounds | White | | All-day background | Brown |

The volume trap worth knowing

Because brown noise concentrates its energy in the frequencies your ears are least sensitive to, it sounds significantly quieter than it is. The same measured decibel level feels perhaps 15–20dB softer than white noise.

The consequence is predictable: people run brown noise far louder than they think. Then they get ear fatigue, headaches, or lighter sleep, and conclude brown noise doesn't agree with them. Usually the volume was the problem.

Both should sit around 45–60dB — a quiet conversation. Measure it once with a free decibel app placed where your ears actually are. This single check resolves most complaints about either noise color.

Does brown noise cause headaches? →

Can you use both?

Yes, and switching by task is reasonable. A common pattern is brown noise for focused work and sleep onset, white noise in noisy shared environments where the broader masking matters more.

Mixing them simultaneously also works — you end up with something roughly like pink noise, which sits between the two and may be worth trying directly instead.

Which to try first

Brown noise, unless you have a specific reason not to. It's the stronger default for focus and sleep onset, and it's the one most people end up preferring.

Move to white noise if brown feels too heavy, if unpredictable sounds are waking you, if you're setting up a nursery, or if you're masking tinnitus.

Both are free here, so the test costs a few minutes rather than a decision.

Brown noise → · White noise → · Brown vs pink noise → · All ten noise colors →