by Daniel Fink, MD, Chair, The Quiet Coalition
Penelope Green, The New York Times, writes about using a sound machine to mask nighttime noise for better sleep. In her article she cites a definition of noise that I like and will probably use it again. “Noise,” writes Green, “is defined as unwanted sounds that could have negative psychological and physiological effects.
Green discusses using white noise to mask unwanted sounds that might disrupt sleep. But while that might help with sleep, it’s not clear that white noise is without health consequences itself.
Humans and our primate and vertebrate ancestors evolved in quiet. As Green notes, the perception of sound is a warning mechanism. It allowed us to detect predators or a hungry baby.
I have measured nighttime noise levels near 30 A-weighted decibels (dBA) in remote areas of Wales and Sri Lanka. (A-weighting adjusts measured sound for the frequencies heard in human speech.) That’s at the low end of the noise range from 30-35 dBA where sounds begin to disrupt sleep.
Sadly, it’s impossible to avoid nighttime noise in urban settings, but, as mentioned in the article, even natural sounds from frogs and other animals in rural settings can disturb the listener. Which is unfortunate, because achieving quiet to allow sleep, rather than relying on sound masking devices or apps, is probably better for our health.