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There’s a growing buzz around pink noise, brown noise, green noise — a rainbow of soothing sounds — and their theoretical effects on sleep, concentration and the relaxation response.

To understand pink noise, start with white, the most familiar of the color noises.

Pink noise turns down the volume on those higher frequencies, so it sounds lower in pitch and more like the natural sound of rain or the ocean.

Scientists at Northwestern University are studying how short pulses of pink noise can enhance the slow brain waves of deep sleep.

Pink noise has a frequency profile “very similar to the distribution of brain wave frequencies we see in slow-wave sleep because these are large, slow waves,” said Dr. Roneil Malkani, associate professor of neurology at Northwestern University Feinberg School of Medicine.