Sleep sounds machine
A sound machine that lives in your browser.
What it does
The Sleep sounds machine is a real, working sound machine built on the Web Audio API: layer white, pink, and brown noise with ocean, fan, and heartbeat sounds in a multi-layer mixer, set the master volume, name and save your soundscape presets (anbu.sleep-sounds.presets), and set an auto-off timer with a 2-minute soft fade-out so the silence does not startle anyone. Extras include an ambient nightlight glow (~60 BPM breathing pulse), a Nightstand mode, shareable setup links for caregivers, and nap logging (anbu.sleep.logs). Keyboard shortcuts: Space play/pause, M mute, N nightstand, / volume, Esc exit. 100% browser-powered — zero server recording.
Who it’s for
Anyone whose baby sleeps best to a fan that does not exist, a heartbeat that does not tire, or an ocean that never checks the weather.
How to use it, step by step
- Tap sounds to layer them (start with brown noise or heartbeat) and set the master volume.
- Name and save the mix as a preset once it works.
- Set the auto-off timer if you want the fade-out after sleep lands.
- Switch to Nightstand mode for the glow, and share the setup link with caregivers.
- Log the nap when it happens — future schedule-you says thanks.
What you get
A layered, saveable, shareable browser soundscape with timer, fade-out, nightlight, and nap logging.
✦ A worked example
You give itBrown noise + heartbeat at low volume, timer 45 minutes.
You getThe nursery hums softly, fades out gently at minute 45, and nobody tiptoes past a creaky sound machine switch ever again.
💡 Tips & tricks
- Brown noise is the deep, rumbly one most babies (and adults) prefer over hissy white noise — A/B test during one nap.
- Keep volume modest and the device across the room; the mixer makes it easy to overdo, and the fade-out is kinder than a hard stop.
Enough reading — the tool itself is one tap away, and it is free.
Try the Sleep sounds machine →