Is white noise or silence better for sleep?

Silence is better as a baseline, since noise produces arousals and lighter sleep even when it does not wake you. White noise is better than intermittent noise, because it masks sudden sounds by raising the noise floor — and intermittent noise is what most people actually have.

Does white noise actually work?

The evidence is weaker than the market suggests. A 2020 systematic review rated the evidence quality low, found considerable inconsistency, and noted some findings suggesting continuous noise could fragment sleep rather than improve it.

Is white noise safe at high volume?

No. An analysis of infant sound machines found many exceeded occupational noise limits at maximum volume and close range. Keep any sound machine as quiet as still masks the noise, and well away from a cot.

Is pink noise better than white noise?

Generally reported as less fatiguing, since it has more energy at lower frequencies and sounds closer to rain or wind. It also masks low-frequency intrusions like traffic better. Small lab studies on pink noise timed to slow-wave activity are promising but not the same as a consumer machine.

White Noise vs Silence

Sound machines are a large market built on a thin evidence base. Worth separating what is established from what is assumed.

Silence is the better baseline

Noise disrupts sleep even when it does not wake you. Environmental noise — traffic, aircraft, neighbours — produces measurable arousals, shifts toward lighter sleep stages, and cardiovascular responses you never remember.

The World Health Organization's environmental noise guidelines recommend keeping nighttime noise below about 40 decibels for exactly this reason, and long-term exposure to nighttime noise is associated with cardiovascular risk.

So the ideal is a quiet room. Nothing beats it.

Where white noise earns its place

Almost nobody has a quiet room.

White noise works by masking — raising the noise floor so intermittent sounds do not stand out against it. Your auditory system responds to change, so a door slamming against silence is far more arousing than the same door against a constant background hiss.

That is a real mechanism, and it is why a fan helps people living on a main road or sharing a wall.

The honest framing: white noise is not better than silence. It is better than intermittent noise, which is what most people actually have.

What the research says

Less than the market implies.

A 2020 systematic review of continuous noise for improving sleep concluded the evidence quality was low, with considerable heterogeneity across studies and some findings suggesting continuous noise could fragment sleep rather than improve it. The reviewers explicitly cautioned against recommending it as a sleep aid on current evidence.

There is somewhat better work on pink noise — which has more energy at lower frequencies and sounds softer, closer to rain or wind. Small studies have found pink noise delivered in synchrony with slow-wave activity improved deep sleep and next-day memory in older adults. Interesting, but that is targeted acoustic stimulation in a lab, not a £40 machine playing hiss all night.

The volume warning

The part usually left out, and it matters most for the group these devices are most sold for.

An analysis of infant sound machines found many produced levels above occupational noise limits at maximum volume and at close range. Paediatric guidance now commonly suggests keeping such devices below 50 dB, at least two metres from the cot, and not running all night.

For adults: keep it as quiet as still does the masking job. Louder is not better, and prolonged exposure to unnecessary sound is not benign.

Practical guidance

Try silence first. Earplugs, better glazing, a draught excluder on the door, a rug. Solving the noise beats masking it.

If you use sound, prefer pink or brown noise to true white — lower-frequency-weighted sound is generally reported as less fatiguing and it masks low-frequency intrusions like traffic better.

Keep it constant. Something that varies is a sound your brain tracks. A fan is a decent option for this reason.

Volume as low as works. Just above the level of the noise you are masking.

Avoid dependence where you can. Sleeping in unfamiliar places gets harder if you need a specific soundscape. Not a serious risk, but worth knowing.

Do not use it to mask snoring. If the noise you are masking is a partner's snoring, you have covered a symptom that deserves attention rather than headphones — including the possibility of untreated sleep apnea. (Whether snoring always means apnea.) (How to decide.)

The other sound problem

If you are the one making the noise, masking is not available to you.

Snoring is turbulent airflow vibrating soft tissue in a narrowed airway, and the highest-return levers are alcohol, sleeping position and nasal congestion. (Everything that swings it night to night.)

Mouth breathing is a large part of it structurally — an open mouth lets the jaw rotate back and the tongue follow it into the airway. Titan's bamboo silk mouth tape is a full strip rather than vented, deliberately, since a vent lets you drift back to mouth breathing without noticing. If the restriction is nasal instead, TitanAir strips open the nasal valve with spring-loaded bands. (The lab testing is published.)

Neither treats apnea, which is why assessment comes first.

The bottom line

Silence is better; white noise is better than intermittent noise, which is what most people are actually choosing between.

The evidence for sound machines is weaker than their marketing — a systematic review rated it low quality and flagged possible fragmentation. Prefer pink or brown noise, keep the volume genuinely low, and fix the noise at source where you can.