Sleeping while listening to bursts of pink noise – background sounds akin to gentle radio static – seems to boost the flow of fluid through the brain, and so might enhance the clearance of waste products that are linked to conditions like Alzheimer’s disease. The pink noise seems to bolster the slow brainwaves that enhance the pumping of blood vessels, which drives the brain’s waste-disposal system.
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By analysing the MRI and EEG recordings, they found that bursts of pink noise strengthened the slow waves they coincided with and briefly boosted the flow of CSF into the brain, compared with no sonic stimulation. This suggests the pink noise also enhanced the flow of CSF through, and out of, the brain. “We know that the flow in is usually balanced with the flow that comes out,” says Lewis.
i went down this rabbit hole before, its not completely useless but won’t do much to improve sleep. some swiss people did some research showing that if you emit pink noise phase locked with certain bands of brain waves, this increases amplitude of respective bands, particularly slow wave bands. this increase supposedly is correlated with “deeper sleep” as measured by slightly better reaction time next day (PVT test). afaikt the effect is pretty weak and not worth discomfort of wearing headband. also if you emit pink noise out of phase it will actually disturb your sleep.
We need more data before doing things this precise. The 40hz animal study that showed increased clearance of TAU proteins was promising but I’m almost certain that if that did work in humans we would need a different frequency, possibly even customized to individual anatomy.
A link to a noise generator…
“If you wait until you are ready, it is almost certainly too late.”
~Seth Godin
“You can wait, I am not the waiting type.”
~Joseph