Studies have found that pink noise, which is fuller, deeper or richer than white noise, actually does an even better job of improving your baby’s sleep because of its subdued quality.

When setting up a white noise machine in a baby's room ... to the fact that recent research has shown pink noise can increase time spent in deep sleep and improve memory. Pink noise is a mix ...

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.