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Many people are familiar with white noise: noise that covers the full range of human hearing at equal intensity, like static from a radio or analogue television set. Pink noise, by contrast, is more intense at lower frequencies, resulting in a deeper sound, like steady rain.
By exposing study participants to pink noise during deep sleep cycles, the researchers were able to increase the percentage of time that participants spent in deep sleep.
“Encouragingly, presenting pink noise at the correct time and intensity did not degrade performance the way disruptive noises did,” Mathew said. “This means that future technology could harness the ability of pink noise to enhance sleep quality without impairing our functioning the next day.”