The roar of late-night traffic is not just annoying for those trying to sleep. It can also have profound effects on their health. A pioneering new study, published this month, has found a clear link between road noise and Parkinson’s disease. The research, which followed more than 3 million Danish participants, found a modest but consistent effect: for every 11.5dB rise in noise level, the risk of the degenerative disorder rose by 3% over the 18-year study. The study adds to the growing body of evidence that auditory nuisance is…