Does a white-noise machine improve sleep?

It may help some people mask irregular noise, but research is heterogeneous and does not support a universal promise.

Should the machine sit next to the pillow?

Not necessarily. Use the lowest useful volume and avoid placing a loud sound source directly beside the ear.

All articles · Noise & silence

White-noise machine for sleep: useful or mostly marketing?

Published 20 September 2026 by the Sleeple editorial team

Short answer. A white-noise machine does not mechanically induce sleep. Its main function is to create a steady background that can make intermittent sounds less noticeable. It is most relevant when the original noise source cannot be reduced.

What systematic reviews say

A 2020 systematic review concluded that evidence for continuous noise improving sleep was very low quality, with results ranging from improvement to disruption. Review.

A 2025 systematic review and meta-analysis of randomized trials reported more favourable outcomes in several populations but still highlighted substantial heterogeneity. Meta-analysis.

Our conclusion is deliberately modest: sound masking may be useful in some contexts, but a machine is not a universal insomnia treatment.

Dedicated machine, speaker or app?

Option	Advantage	Limitation
Dedicated machine	Simple, phone-free operation	Another device to buy
Speaker	Versatile	May depend on phone or network
App	Huge choice of sounds	Keeps the phone in the bedroom
Fan	Background sound plus airflow	Sound and airflow are linked

Features that actually matter

fine volume control;
continuous sounds without obvious looping;
physical controls that work in the dark;
optional timer rather than forced shutoff;
last-setting memory;
no mandatory app;
reliable power and predictable behaviour after outages.

Louder is not better

WHO safe-listening guidance emphasizes both level and exposure duration. For an all-night device, use the lowest level that provides enough masking and avoid placing a loud speaker immediately beside the ear. WHO guidance.

The future Sleeple comparison framework

We will verify volume range and control, sound options, loop quality, timer, power, offline use, physical controls, display dimming, warranty, returns, dimensions, energy use and observed price. No product will be called “best” because it pays a higher commission.