White Noise for Sleep — Which Colour Actually Works
Sleeping with sound feels counterintuitive. But for many people a steady low-volume noise helps the brain settle faster than complete silence does. This guide explains how white noise works for sleep, which colour to choose, and what to look for in a sound app — especially if you also have tinnitus.
For many people, yes. White noise reduces the contrast between background silence and sudden environmental sounds — a car door, a partner turning over — that would otherwise startle the brain awake. A 2021 systematic review found generally positive but mixed evidence across studies. Individual results vary significantly.
Brown noise has more energy in lower frequencies and is often perceived as gentler — closer to deep rainfall. Some people find it easier to listen to for hours. The best choice is whatever you can listen to without it becoming irritating.
How white noise helps you fall asleep
During the day your auditory system is busy. Cars outside, voices in the next room, your own movement — your brain has plenty of sound to process. At bedtime, that competition disappears.
When the room goes quiet, your auditory cortex turns up its internal gain. Small sounds — a car door three streets away, a partner turning over, your own pulse — feel sharper than they would at noon. A sudden noise then jolts you awake because the contrast against silence is high.
Steady background sound restores the competition. The cortex stops scanning for new signals because the signal it was tracking is already there. Sleep researchers describe this as reduced auditory arousal. A 2021 systematic review in Sleep Medicine Reviews found generally positive evidence for sound-based sleep aids, with effects varying widely between individuals.
The mechanism is not unique to white noise. Rain, fans, distant traffic, even an air conditioner can all do the same thing. What matters is that the sound is continuous, neutral, and low enough not to wake you.
White, pink, and brown noise — which colour to pick
The colour of noise describes how its energy is distributed across frequencies. The three most common bedtime choices:
White noise
Equal energy across all audible frequencies. Can sound harsh — closer to untuned TV static. Some people find it too bright for sleep; others use it specifically because it covers a wide range of room sounds.
Pink noise
Softer than white. Lower frequencies are emphasised slightly so it sounds more balanced. Often perceived as steady rain. A popular choice for general bedtime use because it sits comfortably between harsh and rumbling.
Brown noise
Deeper still. The lowest frequencies dominate, giving a rumble closer to distant thunder or a waterfall. Often the most popular bedtime choice — and the one that matches engine noise well on flights.
There is no objectively best colour. The choice that matters is the one you can listen to for an hour without it becoming irritating. Try each for five minutes during the day. The one that fades from your attention fastest is the one your brain settles into. For the full breakdown of how each one is generated and what the research says, see our guide to noise colours.
White noise apps vs YouTube vs sound machines
Three common ways people play sleep sound, and the trade-offs of each:
- YouTube videos. Free and easy. But screens stay on, ads can interrupt at random, autoplay queues up something jarring after the loop ends, and battery drains faster. Many people wake to an unexpected video at 3am.
- Sound machines. Dedicated hardware. Good fidelity, no apps. But they stay in one room — useless when travelling, no help during a stressful day at work.
- Phone apps. Portable, low battery use, can run all night. The catch: most apps pause the moment a phone call comes in, a notification arrives, or the screen locks for too long.
The phone-call problem is small if you sleep undisturbed and never get late-night calls. It becomes the deciding factor if you have tinnitus.
When tinnitus is part of the equation
For people with tinnitus, the silence problem is not abstract. The ringing fills any quiet gap the environment leaves. Bedtime — when the world finally goes quiet — is often when the ringing feels loudest. This is not the tinnitus getting louder; it is the brain filling the gap.
Background sound at bedtime is one of the most consistently recommended self-management strategies in the clinical literature. The mechanism is the same as for sleep generally — reduce the contrast between phantom sound and environment — but the stakes are higher. A sound that stops when a 2am notification arrives can wake someone whose tinnitus was just starting to settle.
Generic white noise apps mask. A tinnitus-focused app does that plus one more thing: a tone matched to the perceived pitch of the ringing, played alongside the masking sound. Your brain hears an external version of the internal signal and can, over time, begin to classify it as non-threatening. This process is called habituation.
The pitch tone is part of the free tier — it does not require a subscription. Many apps charge for this, which makes habituation a paywall feature rather than a starting point.
More on this in our guides: How to sleep with tinnitus, Why is tinnitus louder in silence?, and How frequency matching works. Individual results vary significantly.
How to use a sound app for sleep — 3 steps
Pick a sound that doesn't fight your ears
Start with brown noise if available. Try it for five minutes during the day, lying down with the lights off. If you find yourself getting more alert instead of relaxed, switch to a softer sound (pink noise, light rain). The right sound is the one your attention leaves first.
Set the volume below speech but above silence
You should be able to hear it clearly but it should not make you wince. Set it just loud enough that a whisper next to you would be slightly less clear. The sleep-optimal level is usually lower than people first set it. → Safe listening guide
Let it play through the night
If you set a 30-minute timer and the sound cuts at 3am, you wake when the contrast comes back. Continuous play works better for most sleepers. A slow fade-out is gentler than an abrupt stop — this is a Premium feature in most apps. Free continuous play through locked screen and notifications is the more important option to look for.
Frequently asked questions
Is it safe to sleep with white noise every night?
At comfortable listening volumes, research suggests no clear evidence of harm for adults. Keep the volume below about 50 decibels — roughly the level of a quiet conversation. Do not use in-ear earbuds overnight; speakers are safer. Individual results vary significantly.
What is the best volume for sleep sound?
Quiet enough that you would not have to raise your voice to be heard over it. Loud enough that you can still hear it from across the room. The sleep-optimal level is usually lower than people first set it.
Can I use a white noise app if I have tinnitus?
Yes, and many people do. But a generic white noise app does not match your tinnitus frequency, and it almost always pauses during phone calls. A tinnitus-focused app adds frequency matching and continuous background play through calls and locked screen.
Brown noise vs pink noise for sleep — which is better?
There is no winner across all people. Brown noise is deeper, more like a steady rumble. Pink noise sits between brown and white, often perceived as soft rainfall. Try both and pick the one that you can stop noticing fastest.
Will my phone battery die if I play sound all night?
A modern phone playing audio at normal volume typically uses around 5–10% battery overnight. Keep the screen off, the charger plugged in, and the app set to background play. Apps that show a constantly updating screen drain more.
Do I need headphones to sleep with sound?
No. Speakers are recommended for overnight use. In-ear earbuds can cause ear canal irritation, and the cables can wrap around your neck. If you must use earbuds, choose flat sleep-specific designs.
Can children sleep with white noise?
Pediatric guidance generally suggests keeping a sound source at least two metres from the cot and below about 50 decibels. Consult your paediatrician for infants. Individual results vary significantly.
Sound that plays all night — and through every call
White noise at your tinnitus pitch is free. Continuous play through locked screen, notifications, and phone calls is free. The full 44-sound library, the sleep timer with fade-out, and per-ear control are Premium with a 7-day free trial.
Sources
- Riedy S.M., Smith M.G., Rocha S., Basner M. (2021). Noise as a sleep aid: a systematic review. Sleep Medicine Reviews 55, 101385.
- Stanchina M.L., Abu-Hijleh M., Chaudhry B.K., Carlisle C.C., Millman R.P. (2005). The influence of white noise on sleep in subjects exposed to ICU noise. Sleep Medicine 6(5):423–428.
- Spencer J.A., Moran D.J., Lee A., Talbert D. (1990). White noise and sleep induction. Archives of Disease in Childhood 65(1):135–137.
- Cima R.F.F. et al. (2019). A multidisciplinary European guideline for tinnitus: diagnostics, assessment, and treatment. HNO 67(Suppl 1):10–42.
- World Health Organization (2018). Environmental Noise Guidelines for the European Region. Copenhagen: WHO Regional Office for Europe.