White vs pink vs brown noise for sleep

A passing car, a neighbor’s television or a partner’s snoring can wake you even when the room is otherwise quiet. A steady background sound can make those interruptions less noticeable. That is the idea behind white noise and its deeper-sounding relatives, pink and brown noise. The color names are real acoustic terms, but none of them is a proven sleep treatment.

Start with what is waking you. A steady sound may make intermittent noise less jarring. Earplugs, moving the bed away from a shared wall or closing a window may deal with the noise more directly. If closing the window makes the room too warm, our guide to cooling a bedroom without air conditioning covers other options.

What the colors mean

App and machine labels are not standardized. Two tracks both called brown noise can sound quite different, and informal names such as green noise have no standard definition. Judge by listening at a low volume rather than by the label. A fan or recorded rain is a broadband sound too, even though nobody gives it a color.

What the research shows

The evidence is thinner than the number of sleep-sound apps suggests.

• The overall picture is weak. A 2021 systematic review of 38 articles on continuous white or broadband noise and sleep rated the quality of evidence that it improves sleep as very low. Results ranged from better sleep to worse sleep, and the authors noted that continuous noise may also affect sleep and hearing negatively.
• One small trial found a benefit in a specific setup. Eighteen healthy adults were sent to bed 90 minutes earlier than usual to mimic a night of difficulty falling asleep. With broadband sound at about 46 dB from two speakers, compared with the room’s normal background of about 40 dB, they fell asleep faster, by a median of 38 percent.
• A 2026 study compared pink noise with earplugs directly. Twenty-five healthy adults spent seven nights in a sleep laboratory while researchers played intermittent recorded noise, such as aircraft, rail and road traffic. Pink noise at 40 or 50 dBA reduced REM sleep, and adding it to the environmental noise worsened overall sleep structure despite small improvements in some measures. Foam earplugs mitigated nearly all of the noise’s effects on sleep, although they began to fail at the loudest level tested, 65 dBA. The researchers cautioned against widespread, indiscriminate use of broadband noise.

Headlines about pink noise and deep sleep often describe a different technique. In those studies, a system reads brain waves during sleep and plays short pulses of pink noise timed to the slow waves. One such study in 13 older adults found more slow-wave activity during the stimulation periods, though not across the whole night, and a larger overnight improvement in word recall than on a sham night. That is not the same as leaving pink noise playing all night from a speaker.

Taken together, a steady sound may help some people who are bothered by intermittent noise, but the evidence is thin, and broadband noise can change sleep itself. In the one direct comparison we found, earplugs did better than pink noise.

How to use a sound machine more carefully

If you like a steady sound at night, these steps keep the downside small:

1. Choose the least intrusive sound. No color has better evidence than another, so pick the one you notice least at a low volume. Some people find white noise too hissy and prefer the deeper pink or brown sounds.
2. Keep the volume low. The research settings above used about 40 to 50 dBA. The NIDCD puts normal conversation at 60 to 70 dBA, says sounds at or below 70 dBA are unlikely to cause hearing loss even after long exposure, and warns that long or repeated exposure at or above 85 dBA can cause it. Set the level just high enough to soften the disturbing sound. A sound meter app on your phone gives a rough reading at pillow height.
3. Put the speaker away from your head. A device on or right beside the pillow puts the sound close to your ear. Across the room is gentler.
4. Use a timer if falling asleep is the problem. The small trial that found a benefit measured how quickly people fell asleep, while the study that found less REM sleep played pink noise all night. A timer that switches the sound off after you fall asleep limits how long it plays.
5. Keep headphones quiet. Sleep headphones and earbuds put sound directly into your ears, so the same low-volume rule applies.

Earplugs or a sound machine?

For intermittent outside noise, the 2026 study is the most direct comparison we found, and earplugs protected sleep better than pink noise. They do not suit everyone, and a few practical points decide whether they work for you.

• Fit comes first. A plug that works loose overnight does little. Follow the maker’s instructions for inserting, cleaning and replacing them.
• Think about what you need to hear. If you need to hear a smoke alarm, a baby or someone you care for, check that you still can with earplugs in, or use a different arrangement.
• Check the rating if you need a specific amount of quiet. Some earplugs state a tested noise reduction rating (NRR). Without one, you have no stated figure to compare.

Calm Eden, which shares Lumuwala’s owner, sells Mute Reusable Sleep Ear Plugs. The listing describes a low-profile fit for side sleepers, washing with warm soapy water, and a carrying case. It did not state a noise reduction rating when we checked, so we cannot say how much sound they block. We have not tested them.

If plugs that sit in the ear canal do not suit you, Calm Eden also publishes an earplugs for sleeping guide that compares moldable silicone and soft foam, and a sleep earmuffs collection of styles that cover the ear instead of sitting inside it. Calm Eden is owned by the same company as this site, so treat both as owned-store resources, not independent tests.

Sound machines and babies

Infant sleep machines need extra care. When researchers measured 14 of them at maximum volume, all were louder than 50 dBA at 30 cm, the limit recommended for hospital nurseries, and three exceeded 85 dBA. If you use one, place it well away from the crib, keep the volume low and ask your pediatrician for advice.

When noise is not the whole story

If you still wake often, feel unrefreshed, or someone notices loud snoring or pauses in your breathing, a sound machine is not the answer. Our guide to waking at 3 a.m. covers what to note and when to talk to a clinician. Heat wakes people too, so check the bedroom temperature as well. If you use sound because of ringing in your ears, speak with a clinician or audiologist; this guide does not cover tinnitus.