What brown noise is and why people prefer it
In white noise every frequency has equal power, which the ear hears as bright, almost hissy. Brown noise drops by six decibels per octave as the pitch rises, so almost all the energy sits in the bass. The result is a deep, soft roar that many people find less fatiguing to have on for hours.
It also masks a different set of sounds. Low-frequency noise from the outside world — traffic, a neighbour walking upstairs, a washing machine, bass from music through a wall — is precisely what brown noise covers best. That is why it shows up so often in searches from people trying to sleep during the day.
Brown noise in ShiftSleep AI
The Deep Sleep preset is a brown-noise bed with soft rain over it, and it is the first thing you can tap after a shift. In the mixer, Brown Noise is its own layer with a level slider, mute and solo, so you can hear it alone, adjust it, then bring the other layers back.
Because the engine is procedural there is no loop point. A four-hour day sleep does not involve the same ninety seconds of audio repeating a hundred and sixty times; the sound is computed continuously.
- Brown Noise generator — free tier, no loop
- Deep Sleep preset: brown noise bed with soft rain
- Layer with Rain, Fan, AC, Ocean or Thunder at independent levels
- Mute and solo per layer to tune the mix
- Sleep timer with soft fade-out; all-day option
- Save the mix as a favorite for one-tap play tomorrow
Brown noise vs white noise vs pink noise
A simple way to choose: if the problem is voices and high, sharp sounds, start with white. If the problem is rumble and thumps, start with brown. If white feels harsh and brown feels muddy, pink is the middle. You can also layer white and brown together, which gives a fuller mask than either alone. The guide linked below walks through this in more detail.
For shift workers specifically
Day sleep tends to fail on low-frequency noise: bins being emptied, deliveries, neighbours doing normal daytime things. Brown noise is the color that covers those best, which is why it anchors the default mix. Pair it with a shift profile so the app knows your sleep window and logs the day sleep with one tap.
ShiftSleep AI supports rest and routine with sound and simple logging. It is not medical advice and does not diagnose or treat sleep disorders. If your sleep problems persist, talk to a clinician.
Frequently asked questions
Is brown noise better than white noise for sleep?
Neither is better in general; they mask different things. Brown noise covers low rumble such as traffic and footsteps. White noise covers brighter sounds such as voices. Many people prefer the softer feel of brown for long sessions, and layering both is an option in the mixer.
Does brown noise loop in this app?
No. It is generated live by the audio engine, so there is no repeating file and no seam.
Can I add rain or a fan on top of brown noise?
Yes. The free tier gives you two mixer layers, for example Brown Noise plus Rain. Premium extends the mixer to four layers and unlocks the full sound catalog.