What brown noise is
Brown noise is a steady “shhh” with most of its energy in the low notes. Every step down in pitch is a little louder than the step above it. That's why it sounds deep and soft, not hissy.
People describe it as a hotel air conditioner under a thick blanket, the back seat of a car on a night drive, or the inside of a plane at night. It's not named after the color. It's named after Robert Brown, a scientist who studied the random jiggle of tiny particles. The math behind brown noise is the same kind of random wandering.
Why people fall asleep to it
- It covers sudden sounds. What wakes you is often not how loud a sound is, but the jump from quiet to loud: a door, a car, a dog. Steady sound makes that jump smaller. A small sleep lab study showed this with recorded hospital noise (Sleep Medicine, 2005).
- It's easy on the ears. White noise has a lot of high hiss, and many people find it harsh. Brown noise keeps the highs low.
- It fills the silence. Some people find a very quiet room harder to sleep in than a soft, steady sound.
- It becomes part of bedtime. Many people say the same sound every night turns into a cue that it's time to sleep.
What the research says, briefly. Scientists have reviewed 38 studies on noise and sleep. Their verdict: the research is still early (Sleep Medicine Reviews, 2021). No sleep lab has tested brown noise itself yet. In one small lab study, healthy adults fell asleep faster with steady background sound (Frontiers in Neurology, 2017). So we think you should try it for a few nights and judge for yourself. Read the full research page.
How to set it up for the night
- Keep it soft. Turn it up only until the noise you want to cover sinks into the background. Low and steady works best. If you'd have to raise your voice to talk over it, it's too loud.
- Put the phone across the room, or at least not by your ear. A dresser or nightstand spreads the sound around the room and keeps the volume at your ear gentle.
- Pick your depth. Plain brown suits most people. Deep brown is a slower rumble. If brown sounds too muffled to cover voices or a TV, slide a little toward pink.
- Decide: timer or all night. If you only need help falling asleep, set a sleep timer. A slow fade over a few minutes means no sudden silence. If sounds wake you later in the night, let it play until morning.
- Give it a few nights. Any new sound can feel strange on night one. Most people know by night three whether they like it.
Brown, pink or white for sleep?
Brown is the deepest and softest. Pink is lighter, like steady rain. White is bright, like a fan or TV static. No study shows one color is best for sleep. A study of alertness found no difference between brown, pink and white (a 2025 preprint from University College London, not yet peer reviewed). So pick the one you like. Our free web player has a slider that blends from brown to white, so you can hear them side by side. More in brown vs pink vs white noise.
What to look for in a brown noise app
We read over a thousand reviews of noise apps. These five problems came up most:
- Loops. Most apps play a recording on repeat. At the seam you hear a click, a gap or the same whoosh again, and once you notice it, you can't stop noticing.
- Stopping when the phone locks. Some apps go quiet when the screen turns off, or stop at random in the night.
- Ads. An ad that plays out loud at 3 a.m. is the opposite of sleep.
- Time limits. Some apps stop after an hour unless you pay.
- Sudden silence. A timer that cuts off hard can wake you up.
Brown Noise was built to fix all five. It makes the sound live, so it never loops. It keeps playing with the screen locked. It has no ads and no time limit, and its timer fades out slowly.
Common questions
Can I sleep with brown noise all night?
Many people do. Keep the volume low. If you only need it to fall asleep, use the timer instead.
Headphones or speaker?
For a whole night, a speaker across the room is gentler. If you sleep in headphones, keep the volume low.
Is brown noise better than white noise?
No study shows that. Some people just find it easier on the ears. Try both and trust your own ears.