The quick answer: more sound is not always better
Did you know? A person living beside a busy road may sleep better when a fan produces a steady hum, because passing vehicles become less noticeable. But the same steady sound can irritate someone else, and more sound is not necessarily healthier sound. In fact, a controlled 2026 study found that pink noise reduced REM sleep in the tested conditions, while earplugs protected sleep more effectively against the intermittent noises studied.
This is why the question “Does white noise help sleep?” deserves a more careful answer than an advertisement promising eight hours of deep sleep. The mechanism often discussed is sound masking: adding a relatively steady sound can make sudden background changes less prominent. Yet the masking noise is itself an exposure, and its volume and duration matter.
The 2022 systematic review of auditory stimulation and sleep analysed 34 studies involving 1,103 participants and concluded that strong evidence for using white or pink noise to improve sleep was lacking. The newer 2026 laboratory trial comparing pink noise and earplugs adds an important reason for caution rather than a blanket endorsement of sound machines.
Here is a practical comparison of white, pink and brown noise, what earplugs do differently, why infant hearing safety matters, and how to plan a quieter bedroom without purchasing a promise.
What is white noise?
In the conventional acoustics definition, white noise has equal average power per unit frequency bandwidth across its specified range. As a sound, it can resemble steady hiss, static or rushing air, depending on how it is generated and played.
A fan is not necessarily scientifically exact white noise. It may contain a mixture of broadband sound and specific mechanical tones. Similarly, a phone track titled “white noise” may be filtered or mixed to sound more comfortable than ideal white noise.
The practical question is not whether a sound has a fashionable colour label. It is whether it reduces disruptive changes without introducing new disturbance or unsafe exposure.
What is pink noise?
Pink noise has more energy at lower frequencies than at higher frequencies, following a roughly one-over-frequency relationship over its intended range. A common description is that it has equal average power per octave, giving it a less hiss-like, more balanced sound to many listeners.
Pink noise is sometimes marketed as more natural, soothing or scientifically superior. Those are stronger claims than the physics of its frequency spectrum can establish. How pleasant a sound seems is not equivalent to a proven improvement in physiological sleep quality.
The 2026 study specifically examined pink noise under controlled conditions and found changes in sleep architecture that raise questions about indiscriminate all-night playback.
And what is brown noise?
Brown, or Brownian, noise is generally described as having a stronger reduction in power with rising frequency than pink noise, often approximating a one-over-frequency-squared spectrum across its defined range. It tends to sound deeper or more rumbling.
The term does not mean the sound is produced by brown objects or that it is a natural therapeutic frequency. It describes a mathematical property of a signal, and actual recordings or apps may deviate from an ideal spectrum.
There is no reliable basis to promise that brown noise uniquely resets the brain, cures insomnia or always improves concentration. That requires clinical evidence about outcomes, not just a description of low frequencies.
A plain-English comparison
| Option | Main idea | What to remember |
|---|---|---|
| White noise | Broadband energy roughly even per frequency band | Can mask fluctuations; not a proven universal sleep treatment |
| Pink noise | Greater relative emphasis on lower frequencies | 2026 laboratory findings caution against indiscriminate use |
| Brown noise | Stronger low-frequency emphasis | Deep sound is not automatic proof of better sleep |
| Earplugs | Reduce sound entering the ear | Fit, hygiene, alarm awareness and user suitability matter |
| Quiet bedroom | Reduce noise at its source | Often worth trying before adding constant sound |
What does masking a sound actually mean?
Imagine a neighbour closes a door with a short loud click. In a very quiet bedroom, the click stands out sharply against the background. With a steady low-level sound already present, the contrast may be reduced, so the click is less noticeable to some listeners.
This is acoustic masking. It does not make the door click disappear. It changes how the sound is perceived against a background. If the original noise is too loud, a quiet masker may do little; turning the masking sound up indefinitely can create a new exposure problem.
A masking approach is therefore different from reducing noise at the source, repairing a window seal, closing a door or using suitably fitted ear protection.
Why sudden noise is particularly disruptive
The sleeping brain continues processing aspects of the environment. Abrupt sounds can produce arousals or awakenings, even when the person does not remember every brief event the next morning.
Traffic, an unexpected shout, a door slam or a sudden alarm can disrupt rest in ways that a constant gentle background sound may not. But the actual effect depends on loudness, timing, the listener and other circumstances.
The 2026 study deliberately compared different intermittent environmental sounds, including aircraft and other events, with pink noise and earplugs. That experiment provides more specific evidence than the assumption that sound masking must always help.
What the 2022 systematic review found
Researchers reviewed 34 studies with 1,103 participants, covering white noise, pink noise and some combinations of auditory stimuli. Some studies reported improvements on their selected sleep outcomes, but study quality and methods varied.
The review’s conclusion was cautious: the evidence was not strong enough to support white or pink noise broadly as established sleep treatments. Positive findings in some settings do not make every product or every listener equivalent.
This is an important lesson for interpreting health research. A product can be plausible and even helpful for some users without being proven superior for everyone.
The 2026 experiment that changed the conversation
In a controlled laboratory study, 25 healthy adults experienced several nights with intermittent environmental noises under differing conditions. The researchers compared sound exposure with pink noise at specified levels, foam earplugs and combinations of these measures.
The full report, Efficacy of Pink Noise and Earplugs for Mitigating Environmental Noise on Sleep, found that intermittent environmental noise reduced measured deep N3 sleep. Pink noise could mask some particular noise-induced awakenings but also reduced REM sleep and was associated with less favourable aspects of sleep structure in the tested conditions.
Foam earplugs were generally more effective at reducing the sleep disturbances from the environmental noises studied. The study does not prove that all pink noise is harmful to everyone, or that earplugs are suitable for every sleeper. It does provide a reason to avoid claiming continuous pink noise is a guaranteed brain booster.
Why one laboratory trial is not the entire answer
The 2026 experiment was carefully controlled, but it involved only 25 healthy adults and specific sound levels, patterns and nights. A hospital patient, a newborn, a shift worker and a person living on a noisy road may experience different conditions.
The correct scientific response is to consider the findings together with the broader evidence and safety guidance, not to extrapolate exact REM changes to every device or person.
More research is needed on long-term exposure, different frequencies, ages and clinical conditions. A study that challenges a popular recommendation is a reason for more accurate advice, not a reason for sensational headlines.
Is sound masking the same as ear protection?
No. A white-noise machine adds sound to the room. Earplugs attempt to reduce the amount of external sound entering the ear when worn properly. The two interventions can therefore change the overall acoustic environment in very different ways.
Adding a loud masker to overcome an already noisy bedroom can increase total sound exposure. Well-fitted earplugs may reduce exposure without adding another continuous sound source, although they have their own comfort and safety considerations.
The 2026 laboratory comparison provides a useful demonstration that adding sound and blocking sound should not be treated as the same strategy.
Do earplugs actually help adults sleep?
Earplugs can reduce certain types of environmental noise for a person who can wear them safely and comfortably. The amount of reduction depends on fit, material, sound frequency and whether the earplug is inserted correctly.
They are not magic silence generators. Low-frequency noise, vibration, sound conducted through building structures and a poorly fitted plug can still be noticeable.
And a person must be able to hear essential alarms or communicate about safety needs. If earplugs interfere with necessary awareness, seek another arrangement rather than treating total sound isolation as the only goal.
Which earplug risks should you consider?
Some people experience pressure, discomfort, skin irritation or problems with wax and ear-canal health. Individuals with ear infections, pain, a damaged eardrum or other relevant conditions should seek advice before routinely wearing earplugs overnight.
Cleanliness and appropriate use matter, especially for reusable products. Do not push objects deeply into the ear canal or continue wearing a product that causes pain or hearing changes.
The appropriate advice for an adult is not automatically suitable for a child. Earplugs can also be choking hazards for young children and require particular care.
What if you need to hear a child or an alarm?
A parent caring for an infant or young child may need to hear crying or a baby monitor. Some workers or individuals with medical needs must hear emergency alerts. Noise reduction must not obstruct those safety duties.
Possible alternatives include reducing the source noise, improving room layout, discussing responsibilities with another adult or choosing a safe alarm system appropriate to the household.
Do not assume that earplugs or headphones are the best choice simply because they have a high advertised noise-reduction number.
Do sound machines help babies sleep?
Some studies have found that particular sound environments may help some infants settle, but the American Academy of Pediatrics’ 2023 policy statement on excessive noise exposure raises a critical safety concern about devices marketed for infant sleep.
In an investigation of commercially available infant sleep machines, some devices were capable of producing concerning sound levels, particularly at maximum volume and when placed close to the infant. The AAP advises that, if such machines are used, placing them as far from the baby as possible, keeping the volume as low as possible and limiting duration may be safer.
A product described as “baby safe” is not permission to place a loud speaker beside the child’s ear for hours. Safety must be judged by exposure, distance, duration and appropriate clinical guidance, not marketing language.
A baby’s crib must not become a device station
Keep sleep machines, cords and other equipment out of an infant’s sleep area and follow the CDC’s safe infant sleep advice: place babies on their backs on a firm, flat, non-inclined surface without soft objects or loose bedding.
The safety of the physical environment comes first. The device should not add a cord, choking, entanglement or excessive sound hazard. Parents concerned about infant sleep should consult a paediatric professional rather than build a complicated sound system in the crib.
Does 50 decibels mean a sound is always safe?
Decibels express sound levels on a logarithmic scale, but an exposure’s health implications depend on more than one number. The measurement weighting, distance from the ear, duration, sound pattern, age and susceptibility all matter.
A sound machine measured across the room at one level may produce a different exposure at the sleeping position. Turning the device up to mask occasional road noise can expose the sleeper to additional continuous sound throughout the night.
Avoid using a single online decibel threshold as a universal safe setting for all babies and adults. Follow authoritative paediatric hearing-safety guidance and a cautious low-volume approach.
Headphones all night are not the same as a room speaker
Headphones and earbuds introduce sound very close to the ears and may create comfort, pressure, hygiene or entanglement concerns depending on device type and use. Some people also need to hear alarms or household activity.
A low-volume room source placed sensibly is not acoustically identical to earbuds playing continuously for eight hours. The intended convenience should not override hearing comfort and safety.
If you have hearing conditions, tinnitus or ear pain, ask a qualified professional about safe choices rather than applying generic sleep-audio advice.
Can white noise help someone with tinnitus?
Some people with tinnitus use sound enrichment or masking as part of clinician-directed management. That is a separate clinical context from a healthy sleeper using a machine to mask traffic.
The optimal approach depends on hearing status, the tinnitus experience and other symptoms. A person with persistent ringing, hearing changes or distress should seek appropriate audiological or medical evaluation.
It would be misleading to recommend turning sound up until tinnitus disappears or to promise a sound colour will cure the underlying problem.
Why the fan feels comforting to some people
A fan produces relatively continuous mechanical sound, which can reduce the contrast between the quiet background and some intermittent environmental noises. It may also affect room temperature and perceived airflow.
This means a person may credit “white noise” for improved comfort when cooling or airflow also played a role. The precise mechanism cannot be identified from one person’s experience.
Our Bedroom Light, Noise and Temperature Explained separates these environmental factors.
A Singapore flat beside a road: a realistic example
Imagine a family whose bedroom faces a road with intermittent motorcycles and buses. The loudest disturbances wake the sleeper even though the room is quiet for long periods in between.
A first step is to consider whether the window is properly closed, whether avoidable gaps can be addressed, whether the bed can be placed farther from the noise source and whether a quiet alternative sleeping room is available. These changes aim to reduce noise rather than add it.
If an adult still struggles, a cautious, comfortable masking sound or suitable ear protection might be considered. There is no reason to start at maximum volume, and children require separate safety considerations.
What if neighbours talk through the wall?
Speech can be especially distracting because the brain may pay attention to language even when you are trying not to listen. A steady sound may make the content less intelligible, but it can also add noise that you do not want.
Addressing the source, building acoustics, household arrangements or reasonable neighbour communication may be more effective than continually increasing masking volume.
Noise-control solutions must fit the living environment and local rules. A sleep sound machine cannot fix every structural noise problem.
Why sudden aircraft noise differs from steady rain
The rise and fall of an aircraft sound may stand out against quiet surroundings. A steady sound can make fluctuations less perceptually distinct, but the acoustic impact depends on their frequencies and levels.
The 2026 laboratory study tested different noise types rather than assuming all urban sounds are equivalent. Some sources triggered more arousals and awakenings than others.
The findings support considering the actual noise problem. A fan hum, a banging door, crying, a fire alarm and heavy traffic are not the same acoustic challenge.
Can pink noise improve memory or deep sleep?
Some research studies auditory stimulation timed to particular features of sleep. Those carefully controlled or phase-locked protocols differ from playing a generic pink-noise track continuously through a bedroom speaker.
It is scientifically invalid to take one experiment involving precisely timed sound pulses and conclude that any commercial eight-hour audio loop will boost memory or improve examination results.
The 2026 pink-noise trial is especially relevant because continuous exposure in its conditions reduced REM sleep. Good science distinguishes a targeted intervention from a mass-market claim.
Sleep stages are not a race for the biggest percentage
People sometimes buy sound devices because an advertisement promises more “deep sleep.” But human sleep naturally includes non-REM and REM stages, and healthy patterns vary with age and the individual.
A device that changes one stage’s estimated proportion does not automatically improve the entire night. Clinical studies assess several outcomes and their meaning together.
See REM, Deep Sleep and the Nightly Cycle for a more complete stage explanation.
Why an online review is not a controlled experiment
A customer may report sleeping better after buying a sound machine. That experience can be genuine and still not prove the device caused the improvement. Their bedroom, stress, expectations, daily schedule or other conditions may have changed.
Research evaluates multiple people, controlled comparisons and defined sleep outcomes. Product reviews and scientific tests answer different kinds of questions.
The right response is neither to dismiss personal comfort nor to turn a testimonial into a universal medical recommendation.
A practical three-night observation
If an adult wants to evaluate a non-medical sound arrangement, start with a comfortable quiet bedroom where possible. Notice which environmental noises actually disturb the night and whether the person feels rested in the morning.
Any trial of a sound machine should use a cautious low volume and appropriate placement, and avoid unsafe conditions or symptoms. If the added sound feels irritating or disrupts sleep, there is no need to continue.
Do not deliberately blast noise or disrupt a child’s sleep as an experiment. A few nights of personal observation cannot prove clinical effects or replace evaluation for persistent insomnia.
What about people with anxiety or insomnia?
A consistent gentle sound may be calming for some individuals, but clinical insomnia is not necessarily caused by external noise. Stress, worry, sleep schedules and other conditions can be important.
For persistent adult insomnia, evidence-based care such as cognitive behavioural therapy for insomnia may be relevant. A sound machine should not delay appropriate diagnosis and treatment of an ongoing problem.
Read Stress, Worry and the Cycle of Sleeplessness for the role of alertness and sleep-related anxiety.
What if a partner snores?
Using white noise or earplugs to reduce annoyance from snoring does not treat an underlying breathing disorder. Loud snoring with witnessed apnoeas, gasping or excessive daytime sleepiness warrants clinical assessment.
A partner may still need to protect their own sleep, but the snoring person’s health should not be overlooked while searching for a sound track that hides the noise.
See Snoring, Sleep Apnoea and Nighttime Breathing and the guide to how sleep studies work.
When a quiet room is the better intervention
If the main noise source can be reduced or removed, that may avoid the trade-off of adding continuous sound. Repairing a noisy fan, moving a vibrating appliance away from a bedroom or arranging quieter household routines can be useful.
The appropriate solution depends on building constraints, cost, hearing needs and safety. Silence is not possible in every city, but a quieter room should not be dismissed merely because a playlist is easier to sell.
A sustainable solution may combine modest environmental changes with predictable sleep times and reduced evening stimulation.
Four myths worth checking
Myth: pink noise is scientifically proven better than white noise
No. Evidence varies, and a 2026 laboratory trial raised specific concerns about continuous pink-noise exposure in the conditions tested.
Myth: a louder sound masks better, so louder must be healthier
Masking and hearing safety are different issues. Higher volume adds exposure and is particularly concerning for infants.
Myth: earplugs make every room completely silent
Their effect depends on fit, material and frequency. Some environmental sound and vibration can remain, while essential alarms may become harder to hear.
Myth: a sound machine cures insomnia or apnoea
It does not treat every underlying sleep condition. Persistent insomnia or suspected breathing problems require appropriate clinical care.
Why sound sensitivity differs between people
Two people sharing a room may notice very different things. One may find a steady fan hum reassuring while the other cannot ignore its tone. A third person might be less affected by a continuous background but strongly disturbed by intermittent speech or traffic. These differences do not prove that one person has better sleep biology.
Noise sensitivity, expectations, hearing status, health, previous sleep and the actual type of sound can all influence the experience. A sensible sleep plan should begin by asking what is disturbing the individual, rather than prescribing the same colour of noise to every household.
That is also why an improvement in perceived comfort should not automatically be described as a measured change in REM or deep sleep. Some people feel better with a chosen sound; clinical studies need appropriate methods to establish what happened to sleep physiology.
Frequently asked questions
Does white noise really help people sleep?
It may help some people by masking intermittent sounds, but systematic evidence is not strong enough to recommend it universally as a sleep treatment.
Is pink noise better for deep sleep?
Not necessarily. The 2026 controlled study reported sleep-stage changes that caution against indiscriminate use of continuous pink noise.
What is the difference between white, pink and brown noise?
They describe different distributions of acoustic energy across frequencies. The spectrum alone does not establish medical benefit.
Are earplugs better than a sound machine?
In a specific 2026 laboratory study of intermittent environmental noise, earplugs outperformed pink noise. Individual comfort, fit and safety still matter.
Can babies sleep with a white-noise machine?
Some families use them, but the AAP advises placing machines far from infants, using the lowest practical volume and limiting duration. Keep equipment and cords outside the safe sleep area.
Is there a perfect decibel setting for everyone?
No. Exposure depends on level, distance, duration, age and circumstances. Avoid maximum volume and follow relevant hearing-safety advice.
Are earbuds safe to wear all night?
There can be hearing, comfort and other safety considerations. Seek personal advice if you have ear symptoms and avoid creating an unsafe alarm or caregiving situation.
Can sleep sounds fix loud snoring?
They may mask the sound for a partner but do not treat sleep apnoea or other possible health causes of snoring.
Can I use a fan instead?
A fan may provide steady sound and cooling, but its effect depends on the environment. It need not be true white noise, and comfort and air quality still matter.
What the evidence really asks you to do
Did you know? The strongest practical sleep intervention may sometimes be less noise, not a louder soundtrack. A steady masking sound can help a person feel less disturbed in certain circumstances, but it can also add unwanted exposure.
Start with the real source of disturbance, protect children’s hearing, recognise the limits of current evidence and avoid promising that a colour of noise will create perfect sleep. That is a more useful conclusion than the marketing idea that every bedroom needs a sound machine.
Explore How Sleep Works
Read Bedroom Light, Noise and Temperature, REM and Deep Sleep, Bedtime Routines for Families, How Accurate Are Sleep Trackers?, Why You’re Tired After Eight Hours, and Magnesium and Sleep Evidence.
Evidence and further reading
2022 Systematic Review: Auditory Stimulation and Sleep; 2026 Controlled Sleep Study: Pink Noise and Earplugs; American Academy of Pediatrics: Preventing Noise Exposure in Children; AAP: Practical Noise Safety; CDC: Healthy Sleep.