White noise for adults: does it actually work?

It is 2am and a car door slams somewhere down the street, and suddenly you are wide awake again.

White noise may help some adults in that kind of broken night, most plausibly when unpredictable sound is the problem. Think of it as a sound-stability tool rather than a general sleep treatment. The adult evidence is mixed, and there is no promise of falling asleep faster or sleeping longer.

What white noise may actually be doing

White noise is a steady, broadband sound: a hiss-like background that contains audible frequencies across the hearing range in roughly equal measure. Heard at a low level, it does not remove traffic, neighbours or a partner's movements.

The most defensible explanation is masking. A constant sound can make sudden changes in the background less noticeable, so a pipe creak or a distant siren stands out less sharply. Researchers describe this as a practical hypothesis, not a mechanism proven for every listener.

It also helps to separate two different jobs. Falling asleep (what researchers call sleep-onset latency, the time taken to fall asleep after lights out) is not the same as sleeping longer or waking feeling that sleep was better. Most adult studies that look encouraging concern the first part, in noisy settings, rather than better sleep in general.

What adult studies actually show

The evidence is narrower than many sleep-sounds lists suggest.

One laboratory trial looked specifically at falling asleep. In 18 healthy young adults kept awake 90 minutes past their usual bedtime to create a model of transient insomnia, a broadband sound at about 46 decibels (decibels, shown as dB, are the unit used for sound level), compared with normal room noise at about 40 dB, reduced median time to stable stage-2 sleep from 19 to 13 minutes. That result applied to that small, young, healthy group in that artificial setting, and the group as a whole did not rate their sleep quality as better.

A very small noisy-home study points in a similar direction. Ten adults in New York City, aged 39 to 74, who said high environmental noise disturbed their sleep used a bedroom white-noise device for one week between two no-device weeks. Sleep diaries suggested quicker sleep onset and wrist monitors suggested less wakefulness after sleep onset during the white-noise week. With only ten selected people, a short period and no separate control group, it cannot tell us that every noisy bedroom responds.

Reviews of the wider literature stay cautious:

• A systematic review of 38 studies of continuous noise and sleep found results ranging from improved to disrupted sleep, rated the certainty of evidence as very low, and called for better measurements before white noise is promoted as a sleep aid.
• A 2022 review of auditory stimulation and sleep in adults, covering 34 intervention studies with 1,103 people, found positive sleep findings in 6 of its 18 white-noise studies, no strong evidence overall, and too much variation in sounds, settings and measures to pool the results.
• A newer 2025 review and meta-analysis of 12 randomised trials with 1,301 participants reported lower scores on PSQI (a self-reported sleep-quality questionnaire) after white noise in adults aged 18-64 and in older adults. The authors also reported substantial variation between studies, mixed hospital and home settings, and uneven methods, so it adds some evidence rather than settling the question.

Taken together, that is a conditional picture. White noise is worth considering when broken quiet is the issue. It is not shown to deepen sleep, lengthen sleep in ordinary bedrooms, or work for everyone.

How to try it without making sleep harder

If your room is often disturbed by uneven sound, a short comparison for a few nights is a reasonable experiment. NHS sleep-hygiene guidance lists background sounds such as rainfall, gentle music or white noise as options to try as part of a calm, dark, cool bedroom routine.

Keep the trial modest and easy to judge:

• Give it a clear job. Try it because traffic, neighbours or household sounds keep waking you, not because you hope it will fix sleep in general.
• Keep it low and comfortable. Choose the lowest level that softens the background, well below anything that needs effort to talk over.
• Move it away from your head. Place the phone or speaker across the room rather than beside the pillow, and avoid maximum volume.
• Do not read the slider as science. An app display is not a measured sound level. The number on screen does not tell you what your ears receive in your room, where distance, walls and furnishings all change the result.
• Compare like with like. Keep bedtime, light and room temperature similar for a few nights with the sound and a few nights without, then keep only what felt comfortable and useful.

If you would rather not repurpose a phone for this, a dedicated bedside option such as our WarmWhisper keeps the sound source in one place across the room, with a timer so it does not have to run all night. You can compare it with our other white noise machines.

There is no authoritative adult-specific volume for all-night sleep devices. Two often-quoted numbers are not targets. The World Health Organization/Europe guideline of less than 30 dB(A) in bedrooms concerns environmental night noise, not how to set a machine. The US National Institute for Occupational Safety and Health exposure limit of 85 dBA averaged over an eight-hour working day concerns workplace hearing risk, where louder and longer exposure carries more concern.

Closeness and high volume deserve caution for a simple reason. In a study of eight infant machines and six phone apps (infant devices, not adult sleep devices), 9 of 14 exceeded 85 dBA at maximum volume 10 cm away, while none exceeded that comparison level at 30 cm or 100 cm. It does not establish an adult rule, but it is a useful reminder not to play sound loudly right beside the head.

If the sound itself becomes distracting, keeps you listening out for it, or leaves discomfort or ringing in the ears, turn it off. A mask that becomes a disturbance has stopped doing its job.

Choosing a white noise machine for adults

A phone app is fine for a trial. If the sound earns a place in your routine, a dedicated machine keeps the phone out of the bed and the source across the room. Four things matter more than the number of sounds on the box:

• A volume that goes properly low. The useful range is at the quiet end, so check how gentle the lowest setting is, not how loud the highest one gets.
• A timer. If the sound only needs to cover falling asleep, a 30 to 90-minute timer means it does not play all night.
• A choice of steady sounds. Some people find plain white noise hissy and prefer a fan, rain or a deeper tone. A few options let you find one you stop noticing.
• Where it will sit. A machine you can place across the room, away from the pillow, suits the setup above. A rechargeable one also travels to hotels and spare rooms.

WarmWhisper (£49.90) has 24 built-in soundscapes, a soft light and a 30, 60 or 90-minute timer, according to the current listing, and it is rechargeable. If you also want a gentler alarm, NatureRise (£109.90) combines a gradual wake-up light with calming bedside sounds. Neither is a sleep treatment: each simply gives you a steady sound source you control.

When to stop experimenting

White noise is not a treatment for ongoing sleep difficulty. If problems last for months, affect daily life, or continue despite steadier habits, follow NHS guidance on insomnia and speak to a GP rather than turning the volume up. Do the same sooner if sleep includes loud snoring, gaps in breathing or other worrying symptoms.

For the next few nights, the decision is small. If uneven noise is breaking the quiet, try a low, distant sound and notice whether falling asleep feels calmer. If nothing changes, or the bedroom feels less restful, rule it out and leave the night quiet.

References

• Riedy, S. M. et al. Noise as a sleep aid: A systematic review. Sleep Medicine Reviews 55:101385 (2021). PubMed record
• Capezuti, E. et al. Systematic review: auditory stimulation and sleep. Journal of Clinical Sleep Medicine 18(6):1697-1709 (2022). Full text
• Messineo, L. et al. Broadband Sound Administration Improves Sleep Onset Latency in Healthy Subjects in a Model of Transient Insomnia. Frontiers in Neurology 8:718 (2017). Full text
• Ebben, M. R., Yan, P. and Krieger, A. C. The effects of white noise on sleep and duration in individuals living in a high noise environment in New York City. Sleep Medicine 83:256-259 (2021). Publisher abstract
• Ding, Y. et al. Impact of white noise on sleep quality across age groups and in critically ill/non-critically ill patients: A systematic review and meta-analysis of randomized controlled trials. Sleep Medicine 136:106869 (2025). PubMed record
• NHS. Insomnia - causes, self-care and when to seek GP help. Last reviewed 19 March 2024. NHS insomnia guidance
• NHS Every Mind Matters. How to fall asleep faster and sleep better. NHS sleep-hygiene guidance
• World Health Organization Regional Office for Europe. Noise fact sheet - bedroom guideline context. 1 December 2011. WHO/Europe noise fact sheet
• National Institute for Occupational Safety and Health. Noise-Induced Hearing Loss - occupational exposure context. 30 January 2024. NIOSH guidance
• Hong, S. A. et al. Hazardous sound outputs of white noise devices intended for infants. International Journal of Pediatric Otorhinolaryngology 146:110757 (2021). PubMed record