What 50% is doing here
Pink noise generated by this page measures 53% of its power below 250 Hz, 29% through the speech range and 19% above 4 kHz. That is a wide, even spread with a downward tilt — enough weight to soften a boiler, enough presence to soften a conversation, and not much hiss on top.
Fifty is a starting point picked for a small speaker in a quiet room. On headphones it will be too loud. In a flat on a main road it will be too quiet. The fader is the point.
The mistake: expecting the laboratory result
Pink noise has a research reputation that a continuous track does not earn. The studies people cite delivered very short pink bursts timed to a sleeper's own slow waves, read live from an EEG. That is a closed loop with a machine in it. Playing pink noise steadily from a phone is a different thing and should not borrow the finding.
What a steady track can do is reduce the contrast between a sudden sound and the room around it. That is a smaller claim and it is the one this page is making.
When one layer is the right answer
Most sleep presets on this site stack two sounds. This one does not, because the reason to choose pink noise is that it is already broad. Adding rain on top narrows what you can hear rather than widening it, and adding brown noise underneath turns it into brown noise.
If 50% is not covering the disturbance, the answer is a different colour, not a second layer. Brown noise for rumble, white noise for sharp and bright.
What the generator produces
Rendered on 2026-09-04 from the same per-sample algorithm the browser runs, 30 seconds at 48 kHz, then measured with the EBU R128 meter and an averaged 8192-point FFT.
| Layer | Preset level | Loop | Loudness | RMS | Centre | Low / mid / high |
|---|---|---|---|---|---|---|
| Pink Noise | 50% | generated, no loop | -17.4 LUFS | -17 dBFS | 2511 Hz | 52.5% / 28.8% / 18.7% |
- What this preset cannot do: There is no recording and no loop here, so there is nothing to repeat and no join to hear. The trade is that it will sound identical every night, which some people find easier and some find sterile.
Play pink noise for sleep
- Open this page in any browser.
- The preset is already applied: pink noise at 50%, timer set to all night.
- Press play and set the level with the room at its normal night volume, not in silence.
- Move the phone away from the bed and leave it.
Frequently asked questions
Is pink noise better than white noise for sleep?
It is less bright. Pink noise puts 53% of its power below 250 Hz against white noise's 1%, so it sounds softer over hours. Whether that helps you sleep depends on what is waking you, not on the colour.
Does pink noise increase deep sleep?
Not from a continuous track. The studies behind that claim used short pulses timed to slow-wave activity with an EEG. A steady recording is a different protocol and the result does not carry over.
Can pink noise play all night?
This preset is set to. Keep it quiet enough that important alerts stay audible and put the source away from your head. If you would rather it stop, pick a shorter timer chip before you go to bed.
Why 50% and not louder?
Because 50% covers ordinary household noise on a small speaker, and past about 65% pink noise stops covering more and starts being the loudest thing in the room.
Does this page loop a recording?
No. Pink noise is generated sample by sample in the browser, so there is no file, no loop length, and no repeat to notice.