How sleep sounds help
What wakes us at night is usually change: a car door, a dog, a partner getting up. A steady sound in the room raises the background level, so those changes stand out less. That’s the clearest benefit of sleep sounds, and why they’re most useful in cities, apartments, hotels and shared rooms.
The research is thinner than the popularity suggests. A 2021 systematic review rated the evidence that continuous noise improves sleep as “very low” quality 1. Steady noise has helped in loud places, such as people sleeping through recorded intensive-care noise 2. But in a 2026 sleep-lab study of 25 healthy adults, pink noise at 50 decibels all night was linked to almost 19 fewer minutes of REM sleep, and earplugs protected sleep from traffic noise better than noise did 3.
So treat sound as a tool to try, not a cure: use it when there’s noise to cover, keep it quiet, prefer a timer if you only need help falling asleep, and consider earplugs too. If you have trouble sleeping most nights, it’s worth seeing a doctor.
Choosing a sleep sound
| If you… | Try |
|---|---|
| Live with traffic or loud neighbors | |
| Grew up sleeping with a fan | |
| Find noise boring | |
| Love the sea | |
| Sleep well on planes | |
| Like a summer night |
Settings that matter
- Volume: as low as still does the job. The 2026 study saw effects at 50 decibels, about a quiet conversation, so stay at or below that and lower if you can. With headphones, lower still.
- Timer or all night: if you only need help falling asleep, set the timer for 30 to 60 minutes; it fades out over the last minute. If sounds in the night wake you, leave it running; MoodNoise Pro adds timers of any length with slow fades.
- Avoid sudden sounds: thunder, birds and café sounds have moments that stand out. For sleep, keep them low or off.
- Phone placement: on the nightstand, not the pillow. Plug it in.
Phones and locked screens
Phones pause web audio when the screen locks. Keep the screen on with the brightness down, or use MoodNoise Pro’s Locked screen mode, which plays your mix as a seamless loop that keeps going with the phone locked.
Sound for babies
Steady sound is widely used for babies’ naps and nights, and many parents swear by it. Use it with care. A 2014 study in Pediatrics4 tested 14 infant sound machines at full volume: measured 30 cm away, every one was louder than the 50-decibel limit recommended for hospital nurseries, and three went above 85 decibels. And in 2026 a sleep-lab study found that broadband noise reduced REM sleep in adults; its lead author advised particular caution for newborns and toddlers, who spend more of their sleep in REM 3. If you use sound for a baby, place the phone or speaker across the room, keep the volume low, use a timer rather than playing it all night, and ask your pediatrician.
Look after your ears. Background sound only needs to be loud enough to soften other noises. A good test: you can still hear someone speaking normally next to you. Long listening through headphones should stay well below the maximum, and for sleep, keep the speaker away from your head. For scale: NIOSH’s workplace limit is 85 decibels averaged over 8 hours, halving the time for every 3 decibels more 5, and the WHO estimates over a billion people aged 12 to 35 risk hearing loss from loud listening 6.
Sources
- Riedy SM, Smith MG, Rocha S, Basner M (2021). Noise as a sleep aid: a systematic review. Sleep Medicine Reviews 55:101385.
- Stanchina ML, et al. (2005). The influence of white noise on sleep in subjects exposed to ICU noise. Sleep Medicine.
- Basner M, et al. (2026). Efficacy of pink noise and earplugs for mitigating the effects of intermittent environmental noise exposure on sleep. Sleep.
- Hugh SC, Wolter NE, Propst EJ, Gordon KA, Cushing SL, Papsin BC (2014). Infant sleep machines and hazardous sound pressure levels. Pediatrics 133(4):677–681.
- National Institute for Occupational Safety and Health (CDC) (2024). Noise-induced hearing loss. cdc.gov.
- World Health Organization (2022). WHO releases new standard to tackle rising threat of hearing loss. who.int.
Watch: fall asleep with the sleep timer
Step by step: fall asleep with the sleep timer
- Choose a sleep timer. Under the sounds, pick how long it should play: 15 minutes to an hour, free.
- It fades out. When the time is up the sound fades away slowly, so the change doesn’t wake you.
- All night, with Pro. MoodNoise Pro adds timers up to 10 hours and fade schedules: fade slowly over the last 5 to 60 minutes.
Questions
What is the best sound for sleep?
There’s no single best one. Brown noise, pink noise, rain and fan sounds are the most popular because they’re steady and soft. Try one each night for a few nights.
Should I play sleep sounds all night?
If sounds in the night wake you, a steady sound all night helps more than a timer. If you only need help falling asleep, a timer is enough. Either way, keep the volume low.
Will it keep playing if my phone locks?
Web audio pauses on many phones when the screen locks. Keep the screen on, or use MoodNoise Pro’s locked-screen mode.
Is it safe to use sleep sounds for babies?
Widely used, at a low volume and a distance from the crib, with a timer. See the section on babies above, and ask your pediatrician if you have concerns.
Last updated .