White, Pink or Brown Noise: Which Is Best for Sleep?

White, pink and brown noise explained with a clear chart, what the research says about each for sleep, and how to pick the right one for your bedroom.

By CalmDepth editorial team · Checked October 31, 2026 · 7 min read

Gentle waves running up a beach at dusk under a pink sky — Photo: Mitchell Luo · Pexels

Noise colours sound like marketing, but they describe something precise: how a sound's energy is spread from low pitches to high ones. White noise spreads it evenly per hertz and sounds bright, like a detuned radio. Pink noise tilts towards the low end and sounds like steady rain. Brown noise tilts further still and sounds like a deep waterfall or the rumble inside a plane.

Which one helps you sleep depends far more on your ears and your bedroom than on any ranking. Here is how they differ, what the research shows, and a quick way to choose.

The three colours in one chart

Line chart of power per hertz relative to 63 Hz: white noise flat at 0 dB, pink noise falling 3 dB per octave to minus 21 dB at 8 kHz, brown noise falling 6 dB per octave to minus 42 dB at 8 kHz — Line chart of power per hertz relative to 63 Hz

Frequency	Pink (dB)	Brown (dB)
63 Hz	0	0
125 Hz	minus 3	minus 6
250 Hz	minus 6	minus 12
500 Hz	minus 9	minus 18
1 kHz	minus 12	minus 24
2 kHz	minus 15	minus 30
4 kHz	minus 18	minus 36
8 kHz	minus 21	minus 42

Power per hertz relative to 63 Hz. These slopes are the definitions of the colours: white is flat, pink falls by 3 dB for every doubling of frequency, brown by 6 dB.

Because our ears hear in octaves, flat white noise ends up with as much energy in the single top octave (8 to 16 kHz) as in all the octaves below it combined. That is why it sounds hissy. Pink noise gives every octave the same energy, which many people hear as balanced. Brown noise leans so far towards the bass that the top end almost disappears.

How each one sounds and who it suits

Colour	Sounds like	Masks best	Often chosen by
White	Radio static, a hissing kettle	High pitched noise: voices, birds, a ringing tinnitus like whine	People in loud cities, shift workers sleeping by day
Pink	Steady rain, wind through trees	A broad mix of household and street sounds	People who find white noise too sharp
Brown	A deep waterfall, a plane cabin, distant surf	Low rumbles: traffic, snoring, a neighbour's bass	People who like a deep, enveloping sound
Grey	Tuned to sound equally loud at every pitch	Mixed noise	Listeners sensitive to particular pitches
Green	The middle of the range, like a calm forest	Gentle masking	People who want something more natural

Blue and violet noise tilt the other way, towards the treble; they are rarely used for sleep but some people like them for focus.

What the research says

The science is thinner than the enthusiasm.

Continuous noise in general. A 2021 systematic review of 38 studies in Sleep Medicine Reviews rated the evidence that continuous noise improves sleep as very low quality. Some studies found people fell asleep faster; others found more disrupted sleep. The authors recommend better research before noise is promoted as a sleep aid.
Pink noise in the lab. Several studies have used short bursts of pink noise, timed by computer to the brain's slow waves during deep sleep. A small 2017 study of 13 adults aged 60 to 84 (Papalambros and colleagues, Frontiers in Human Neuroscience) found that pink noise pulses timed to slow waves strengthened slow wave activity during stimulation and improved overnight word recall compared with a sham night. That is not the same as playing pink noise all night from a phone, and it is often misquoted as if it were.
Brown noise. Its popularity has run well ahead of the research. People love it for its depth and comfort, which is a perfectly good reason to use it, as long as we do not pretend it has been proven to do more.

The practical takeaway: noise colours are tools for comfort and masking. Pick the one that makes your room feel quietest and that you enjoy hearing.

A quick way to choose

Listen to the problem. Lie in bed with the lights off and notice what actually bothers you. High voices and birds? Low traffic and snoring? Silence that leaves your thoughts too loud?
Match the colour. High sounds: white or pink. Low sounds: brown. A busy mind: pink, brown or rain.
Set it soft. Just loud enough to blur the problem, quiet enough to talk over. The WHO and ITU safe listening standard sets 80 dB for 40 hours a week as an adult reference; a sleep sound should sit far below it.
Give it three nights. The first night with any new sound feels unusual. Judge on the third.
Keep it running or fade slowly. If you wake when it stops, let it play all night.

Mixing colours with nature

Pure noise can feel clinical. Many people prefer a noise bed under something natural: brown noise under rain on a tent, pink noise under a crackling fire. In CalmDepth, Melo's library has 43 noise colours, from White, Pink and Brown to softer variations such as Warm Pink, Deep Brown and Velvet Hush, and you can layer them with any of our other 2,012 sounds (up to eight layers with premium, three free).

The library also has 106 binaural beats, several of which are carried on brown noise or ocean sound. If you are curious about those, read binaural beats for sleep. For the broader picture of sounds for sleep, see our sleep sounds guide.

CalmDepth is arriving soon on iPhone and Android; the waitlist is open on our home page.

Noise for focus, naps and babies

Use	Colour often chosen	Tip
Focus at a desk	Brown or pink	Low level, so it fades into the background after a few minutes
Open plan office	Pink	Masks speech without the hiss of white noise
A short nap	Brown	Use a 20 minute timer with a fade
Babies (for the room)	Soft pink or brown	Very low, well away from the cot
Waking at night	The colour you fell asleep to	Familiarity helps; see how to fall back asleep

Myths about noise colours

You may read	What is known
"Brown noise is scientifically proven to be best for sleep."	Research on brown noise for sleep is limited; preference is a good guide
"Pink noise boosts memory."	Only in lab studies with precisely timed pulses, not continuous playback
"Louder masks better."	A soft level masks most sounds and is kinder to your ears
"White noise is only for babies."	Adults use it widely, especially in noisy cities

FAQ

Is brown noise better than white noise for sleep?

Neither is proven better. Brown noise is deeper and masks low rumbles such as traffic and snoring; white noise is brighter and masks high sounds. Many people find brown or pink noise more pleasant to sleep with.

What is pink noise good for?

Pink noise has equal energy in every octave, so it sounds balanced, like steady rain. It is a good all round choice for masking household and street noise.

Why does white noise sound so harsh?

White noise has equal energy per hertz, which puts as much energy in the highest octave as in all lower octaves combined. Our ears hear that as hiss.

Can I sleep with brown noise all night?

Yes, for most adults at a soft level, with the speaker away from your head. Turn it down if you notice ringing ears or a muffled feeling in the morning.

Is green noise a real thing?

It is a popular name for noise centred in the middle of the audible range, often described as sounding like nature. It is not a strict technical standard like white, pink and brown noise.

Does pink noise improve memory?

Lab studies that played short pink noise bursts precisely timed to deep sleep brain waves have found links to better memory in small groups of people. Playing pink noise continuously from a phone has not been shown to do the same.