Pink noise during sleep boosts brain waste clearance

MIT researchers have found that brief bursts of "pink noise" during sleep can strengthen cerebrospinal fluid (CSF) waves, enhancing the brain's waste-clearing process. This discovery offers a potential new method to boost brain health during rest. The study, published in Science Translational Medicine, used auditory stimuli timed to slow brain waves, increasing both electrical wave amplitude and CSF flow in 14 healthy volunteers. The technique overcomes fMRI-EEG interference to deliver precise, sleep-safe sound bursts. Researchers aim to explore whether this enhanced CSF flow could improve memory, cognitive function, or slow neurodegenerative diseases like Alzheimer's, which involve harmful protein buildup. A startup is developing a home-use headband device based on this technology.