Slumber WaveSound, tuned to your nervous system.
Some sounds just feel like rest: rain settling on a roof, the low hum of a fan in a dark room. Sleep researchers have spent decades asking why, and their findings shaped every sound in Slumber Wave. Below is that research in plain language: what was studied, what was found, and where you can read it yourself. We make no miracle claims. This is published science, next to a library of sounds that many people find genuinely calming.
Built on peer-reviewed research.
Every sound in Slumber Wave earned its place in a published study before it earned a place in your night. Below is what sleep researchers found, in plain language and with citations.
In one study: 38% faster sleep onset
White noise is the reason so many people can't sleep without a fan. A steady wash of sound smooths over the small spikes in your night (a door, a passing car, a ticking radiator) that a half-asleep mind tends to treat as alarms. When researchers played this kind of even, broadband sound, participants fell asleep measurably faster. Your bedroom may be quieter than a lab, but the same idea applies.
Messineo et al. 2017
In one study: 3× memory consolidation
Pink noise is white noise with the sharp edges sanded off: deeper, softer, closer to steady rain. In the Northwestern study, sleepers who heard gentle pulses of it overnight remembered about three times more of what they'd learned the day before. Research suggests the sound may support the quiet filing work your brain does while you sleep.
Northwestern 2017
In one study: lower heart rate and cortisol
Rain on the roof feels like permission to stop, and researchers have long wondered why. Across several studies, people who listened to nature sounds had lower heart rates and less cortisol (the body's main stress hormone) than people sitting in silence or city noise. Many people notice something the numbers miss: the night simply feels softer.
multiple studies
In one study: 43.75 min less wake time
You know the 2 a.m. spiral: replaying today, rehearsing tomorrow. In Ong's trial, people with long-running sleep trouble practiced mindfulness meditation, and by the end of the study they spent far less of the night lying awake. A calm, steady voice may give a racing mind something gentler to hold on to.
Ong et al. 2014
Results vary from person to person. The figures come from independent academic studies and are not medical claims made by Slumber Wave.
The internet sleeps on it (literally, and loves it).
“I fall asleep before the rain track even loops. Honestly the best mixer I've used.”
Ashley S. · Slumber Wave user“The womb sounds put my newborn to sleep in minutes. A lifesaver for new parents.”
C. Whitworth · Slumber Wave user“I use the focus mixes at work and the ocean waves at night. One app, two lives.”
Cody M. · Slumber Wave user“Minimal, calm, and it just works. No ads yelling at me before bed. Five stars.”
Kimberly K. · Slumber Wave user“Nothing beats drifting off to my own mix. It feels like the app was made for me.”
Kekola · Slumber Wave user“I fall asleep before the rain track even loops. Honestly the best mixer I've used.”
Ashley S. · Slumber Wave user“The womb sounds put my newborn to sleep in minutes. A lifesaver for new parents.”
C. Whitworth · Slumber Wave user“I use the focus mixes at work and the ocean waves at night. One app, two lives.”
Cody M. · Slumber Wave user“Minimal, calm, and it just works. No ads yelling at me before bed. Five stars.”
Kimberly K. · Slumber Wave user“Nothing beats drifting off to my own mix. It feels like the app was made for me.”
Kekola · Slumber Wave user
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Find the scenes you like, mix your own soundscape, and make tonight a calmer one.