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Of course, sleep disorders are based on a multiplicity of factors, but it is not unreasonable to infer that at least some of these may be related to environmental noise. In Europe, tens of millions of people complain chronically about poor sleep quality, with difficulty falling asleep and maintaining sleep being almost universally cited. Among this group, about 15% are using hypnotic drugs. For most of these people, and even to a greater extent for the hypnotic drug users, the main consequence of poor sleep quality is the subsequent impairment in the quality of life. Increase of fatigue and sleepiness, together with decrease in performance and productivity, have a major impact on both public health and the large-scale economy.