Sleep: Noise & Sound Mixer

Sleep is a sound mixer, not a playlist. Turn on the layers you want, set how loud each one sits, and it plays them together for as long as you need — through the night, or until the timer runs out.

WHAT YOU CAN MIX

Masking noise — white, pink and brown. The steady, structureless sound that covers traffic, a snoring partner, a thin hotel wall or a noisy office. Generated live on your phone, so it never loops and never repeats.

Ambient sounds — rain, a box fan, ocean waves. Recorded loops, seam-matched so you never hear the join.

Focus tones — binaural beats at beta, theta and delta frequencies, for people who want to try them. Headphones required: the effect depends on each ear hearing a different tone.

Every layer has its own volume, so you can put rain over brown noise and mix them the way that actually works for you rather than picking one preset someone else designed.

SLEEP TIMER

15, 30, 45, 60 or 90 minutes, or type any number of minutes you like. Playback stops on its own, so nothing runs all night unless you want it to.

SAVE YOUR MIXES

Found a combination that works? Save it as a preset and bring it back in one tap. Sign in with Google if you want your presets on more than one device — the app works completely normally without an account, and never asks you to make one.

PLAYS IN THE BACKGROUND

Lock the screen, switch apps, put the phone down. Playback continues, with controls in your notification shade and on your lock screen, and your headset's play/pause button works the way you expect.

NO STREAMING, NO DOWNLOADS

Every sound is either generated on your device or already inside the app. Nothing streams, nothing downloads, and the whole thing works in aeroplane mode.

ABOUT BINAURAL BEATS

Honestly: the evidence for binaural beats is limited and mixed. Some people report feeling more relaxed or more focused; controlled results are inconsistent, and individual results vary. Masking noise has a far simpler and better-established job — it covers other sounds. Treat the focus tones as an optional experiment, not a remedy. Sleep is not a medical device and does not diagnose, treat or prevent anything.

FREE, WITH AN OPTIONAL SUBSCRIPTION

The app is free and supported by ads. A Sleep Premium subscription removes them. Every sound, the timer and unlimited presets are in the free version — the subscription buys quiet, not features.

No microphone, no location, no contacts, and no account needed to use the app.