London — Report Says Pink Noise May Help Brain Clear Waste in Sleep

Pink noise, not the more familiar white noise, may be the better bedtime sound choice for helping the brain carry out its overnight cleanup, according to a report published by Marie Claire UK.

The outlet's report cites unnamed scientists discussing the idea, but does not publish the underlying study, a journal citation, or specific researcher names in the material reviewed for this story. Readers who want the full technical detail should read the original report directly.

What does the Marie Claire UK report actually claim?

The headline and framing of the piece draw a contrast between pink noise and white noise, arguing that pink noise is the better option for sleepers who want their brain to do more effective housekeeping overnight. The report frames this as new research, according to Marie Claire UK, though the write-up reviewed for this story does not name the study, its authors, or the journal where it appeared. Because those details were not available in the source material, this report does not repeat specific figures, percentages, or study names that cannot be verified against a primary document.

What is the difference between pink noise and white noise?

Both are common labels for background sound used to mask disruptive noise during sleep. White noise spreads sound energy evenly across all frequencies, producing the steady hiss many sleep apps use by default. Pink noise lowers the volume of higher frequencies relative to lower ones, which many listeners describe as deeper and less harsh than a flat white-noise hiss. The distinction is a matter of audio engineering, not a judgment about which sound is healthier, and switching between the two is simply a setting change on most sleep-sound apps and machines.

Does sleep help the brain clear waste?

The idea that sleep plays a role in clearing waste from brain tissue is the subject of ongoing scientific study, and it is this general area of research that the Marie Claire UK report connects to pink noise. The report reviewed for this story does not spell out the mechanism by which a sound frequency would influence that process, nor does it provide measurements showing how much cleanup, if any, pink noise produces compared with white noise or silence. Anyone deciding whether to switch sound settings before bed should treat the claim as an emerging idea covered by one outlet rather than settled science, and should check the original report for whatever sourcing it provides.

What should someone do Monday night if they want to try it?

Switching a sleep app or sound machine from white noise to pink noise costs nothing and takes a few seconds on most devices, since the option is usually listed in the same settings menu. People who already rely on a consistent bedtime, a dark and cool room, and a regular wake time can add a pink-noise track to that routine without changing anything else. Those routines are standard, widely recommended sleep habits independent of any noise-color debate, and they remain the baseline advice most sleep guidance repeats regardless of which background sound a person chooses.

For readers building out a broader wind-down routine, a mindfulness-focused tool such as the mindfulAI Keyboard can sit alongside a sound machine as part of an evening routine, though it has no direct connection to the pink-noise claim itself.

Where can readers find more context on sleep and daily habits?

HTT's Wynter's Wellness desk has covered related ground on daily routines that affect energy and focus, including a piece on processed foods, cravings, and strategies to quit and another on walking meetings as a way to boost health and productivity. Neither piece addresses pink noise directly, but both speak to the same underlying question the Marie Claire UK report raises: which small, low-cost habit changes are backed by enough evidence to be worth adopting, and which ones deserve a second look before anyone changes their nightly routine.

At this stage, the pink-noise claim sits in the second category. The sound-setting change is free and reversible, which is likely why it has drawn attention, but the report itself does not supply the study details needed to say how strong the evidence is.