I didn't see a link to the paper, so can only assume they were introducing new noises at randomized decibel levels to study participants. My start-up uses soun

I didn't see a link to the paper, so can only assume they were introducing new noises at randomized decibel levels to study participants. My start-up uses sound to enhance sleep's restorative function. So blankly saying "noise at decibel level x disrupts sleep" is not true. Over the last 10 years, research has shown that precisely timed micro-auditory stimulations increase slow-wave activity, and accompanying biomarkers of health. There are now more than 50 published peer-reviewed papers regarding this phenomenon. We link to some of these on our website https://affectablesleep.com https://affectablesleep.com Environmental noise is different than precise stimulation based noise, but most of us have an adaptation level to environmental noise. I remember when I first moved to Chile having dinner with an Argentinian and an Indian, and the Argentinian said the streets in Santiago were so loud it was important to get an apartment on a higher floor. The Indian guy looked around and was like "what noise"? To him, Santiago was a peaceful and quiet environment.