Sound for sleep

Pro: the whole night

The full mixes, up to six sounds at once, and timers to all night. New recordings and features reach Pro first.

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Yucatán Peninsula, Mexico

Oaxaca, Mexico

Rio de Janeiro, Brazil

Puerto Galera, Philippines

Gelderland, Netherlands

Troms, Norway

Veracruz, Mexico

French Guiana

Lake Ontario

Ashdown Forest

Alajuela, Costa Rica

Northumberland, England

Sierra Mazateca, Mexico

Real field recordings. We name the recordist whenever we know who it was.

Noise

Made in your browser, not a recording.

Made sounds

Sleep

night wetland · 15 min

Sound for sleep, on greensound, is either one of four noise colors or a real recording, playing on a timer that fades out rather than stopping abruptly. The Sleep mix opens on night wetland, a real field recording, with brown noise low underneath, and, with Pro, can run for up to eight hours if you choose all night.

White, pink, brown or green noise at night?

All four noise colors are generated live in your browser and never repeat within a session, whichever length you choose. Green, white and pink noise, and every real recording, are one tap away if you would rather try something else instead of the Sleep mix's own pairing.

A real recording or a noise color?

Night wetland is a real recording of frogs and crickets after dark, made near Felipe Carrillo Puerto, Quintana Roo, Mexico. The Sleep mix plays it at 85%, with brown noise at 30% underneath, so the recording carries the mix. Its own page has the full credit: the recordist, the place and the date.

How long should the sound play?

With Pro, the timer offers 15, 30, 60 and 90 minutes, or all night, which is eight hours. The Sleep mix starts on all night; change the length before or after you press play. Without Pro, a free sound plays for fifteen minutes a day. However long it runs, it fades out over about half a minute at the end, rather than stopping suddenly.

Can it play all night?

With Pro, yes. All night is scheduled in full the moment you press play, on the browser's own audio clock. When the time is up it fades out on its own.

If your mind is the noise, not the room, a slow story may suit you better. Lullable, from the same maker, reads quiet, true stories on iPhone. Lullable sleep stories

Updated October 2026

Where the sound comes from

Night wetland. Recorded by Felix Blume on October 30, 2015, near Felipe Carrillo Puerto, Quintana Roo, Mexico. Public domain (CC0). License terms Original recording on freesound.org

Brown noise. Made in your browser, not a recording.

Listen safely

This is a sound, played back through whatever speaker or headphones you already own. It doesn't diagnose, measure, or promise anything about how you sleep, focus, or feel — it's just noise and a handful of real recordings, mixed the way you like them.

Keep the volume low enough that you'd still notice a smoke alarm, a phone ringing, or someone at the door. If you fall asleep in headphones, choose a volume and a pair you'd be comfortable wearing all night, and a session length that ends when you'd want the sound to stop.

If you use this near a baby, keep the speaker several feet from the crib, never inside or clipped to it, and keep the volume low — the same care you'd take with any sound machine in a nursery.

If your relationship with sound, or with sleep, feels difficult rather than simply restless, a doctor or audiologist is the right person to talk to. This is a mixer, not a clinician.

Is it safe to sleep with headphones in?

If you do, choose a volume and a pair of headphones you would be comfortable wearing for the length of the timer, and keep the volume low enough that you would still notice an alarm. The listen safely note below has more detail, and it applies here the same as everywhere else on this site.

Can I add more sounds to the Sleep mix?

With Pro, yes. The mixer supports up to six sounds playing together; add another noise color or recording by hand, or remove one from the mix, and adjust each one's own slider.

Does the recording repeat in a way I would notice?

It can. Night wetland is a loop of twenty to forty seconds with a crossfade at the seam so it cannot click, but a close listener may still notice the content come back around. Brown noise, underneath it, never repeats, because it is generated fresh the whole time.