# Pink noise could make your sleep deeper

> Scientists discovered that a specific sound pattern syncs with brain waves to boost sleep quality and clear brain waste.
- Title: Pink noise could make your sleep deeper · TIME | Shortify
- Summary: Scientists discovered that a specific sound pattern syncs with brain waves to boost sleep quality and clear brain waste. Pink noise timed to peak brain waves…
- Keywords: pink noise, sleep science, brain waves, cerebrospinal fluid, neuroscience, mit, laura lewis, joshua levitt, slow waves, sleep quality, brain health, Pink
- Source: TIME — https://time.com/article/2026/09/21/can-pink-noise-improve-your-sleep
- Author: Veronique Greenwood
- Published: 2026-09-21T13:05:31.991+00:00
- Read time: 1 min
- Topics: pink noise, sleep science, brain waves, cerebrospinal fluid, neuroscience, mit, laura lewis, joshua levitt, slow waves, sleep quality, brain health
## Your brain stays alert while sleeping
Even during sleep, your brain monitors the outside world through sounds and smells. This makes evolutionary sense: your brain needs to detect potential danger.
## Some sounds deepen sleep
Researchers at MIT played pink noise to sleeping people in an MRI machine and observed cerebrospinal fluid pulsing in response, suggesting the sound could improve sleep quality.
## Brain fluid clears waste during sleep
Scientists believe cerebrospinal fluid flowing around the brain removes biochemical waste products during sleep, which may be why sleep feels restorative. Large waves of fluid pulse through the brain when people fall asleep.
## Pink noise vs white noise
Pink noise is similar to white noise but lower-pitched and more even sounding, making it less harsh. A 2013 study found pink noise improved memory performance the next day, though later findings have been mixed.

> It's less harsh-sounding than static white noise that people might be familiar with.
## Timed bursts amplify brain waves
Researchers developed an algorithm to play 50 millisecond bursts of pink noise precisely when slow brain waves peaked during sleep. This amplified slow waves and increased cerebrospinal fluid flow into the brain.
## Next: treating sleep disorders
The discovery opens doors to studies testing whether boosting cerebrospinal fluid flow could help people with poor sleep or neurodegenerative conditions caused by impaired brain waste removal. A wearable device is in development.
## Key takeaway

Pink noise timed to peak brain waves during sleep increases cerebrospinal fluid flow, which may remove waste and improve sleep quality.