Sleepyland calming sound machine
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Sleepyland

A sound machine that runs in your browser

Brown, pink, and white noise with ocean waves and cabin rumble, all synthesized on your device. No audio files, no account, no uploaded mix.

Choose Sleep, Relax, or Focus. Each state is a distinct engine recipe with its own rhythm, spectrum, and movement. Energy scales movement depth and pace without changing volume. Tune reveals noise color, shared warmth, independent noise and wave levels, and wave pace. Session plans are Endless, Countdown, and Focus Interval.

Start quietly, especially with headphones, and set the mix that feels most comfortable to you.

A silent product demo shows mode selection, Tune, playback, and the live spectrum.

Sleep
Deep and steady: a dark brown bed with slow surf.
Relax
Slow and spacious: a softer pink field with broad spatial movement.
Focus
Rhythmic and clear: a clearer pink field with steady, low-salience rhythmic movement, and no surf.

Controls

What you can do.

Each state is a distinct engine recipe with its own rhythm, spectrum, and movement.

  • Sleep, Relax, and Focus functional soundscapes with distinct rhythm, spectrum, and movement
  • Gentle, Balanced, and Strong Energy without hidden volume changes
  • Brown, pink, and white noise synthesized locally in the browser
  • Procedural ocean waves with changing swell, foam, wash, and undertow
  • Deep airplane-like cabin sound through dark brown-noise shaping
  • Independent noise and ocean-wave volume controls
  • Live post-mix spectrogram and spectrum curve
  • Interactive tap and hold filtered-noise spectrum
  • Endless, countdown, and Focus interval sessions with smooth completion
  • On-device sound generation and browser-local settings storage

Privacy

Sound is made on your device, and your settings stay there.

The privacy page describes what can leave the device and where retention and deletion remain provider-controlled.

On-device synthesis
Sleepyland synthesizes brown, pink, or white noise, procedural ocean waves, and an airplane-like rumble in the page.
No audio files
The sound generator uses no recorded or hosted audio files, product accounts, or server-side audio.
No account
The hosted product is free to use without an account.
Settings stay in this browser
Your state, Energy, session, and tuning are stored in this browser.
No microphone or replay
There are no accounts, ads, session replay, cloud audio, or microphone permissions.
Analytics
On the canonical production site, anonymous, cookieless events can include the selected state and session kind; they do not include Energy, tuning, exact playback duration, or audio.

Research

Research for a better sleep setup.

Drafted by an AI agent and checked against the linked sources by a separate Codex AI reviewer; no human clinical review is claimed.

Browse all research

Questions

Questions about accounts, uploads, and limits.

Does it need an account?

No. The hosted product is free to use without an account. There are no accounts, ads, session replay, cloud audio, or microphone permissions.

Does it upload anything?

Not sound. The sound generator uses no recorded or hosted audio files, product accounts, or server-side audio, and settings are stored on this device.

On the canonical production site, anonymous, cookieless events can include the selected state and session kind; they do not include Energy, tuning, exact playback duration, or audio. The privacy page lists what can leave the device.

What does it need to run?

A browser with JavaScript and Web Audio API support. Sound is generated in the page; there is no server-side audio.

Is it a medical device?

No. Sleepyland is not a medical device, diagnosis, or treatment. The names Sleep, Relax, and Focus describe intended listening contexts, not guaranteed outcomes.

Start quietly, especially with headphones, and set the mix that feels most comfortable to you.

Who made it?

Built by Hraness. Hraness is an advanced software research organization dedicated to advancing the frontier of machine intelligence. hraness.com lists sleepy.land among its public projects.

Sleepyland is open source on GitHub under the MIT License, and research contributions are welcome.