This study has great potential impact, and the authors deserve congratulations for the complexity of the research. However, it should be noted that it was performed in only one location (Porto Alegre, Brazil), and the results do not accurately represent a global climatic characteristic. An important point that defines a subtropical climate, as that of the study’s location, is the presence of four clearly defined seasons that vary greatly in temperature range. Such a wide variation of temperatures does not occur at all latitudes. As a result, a well-defined winter has a greater impact on the health of the population, causing more individuals to seek medical assistance and consequently leading to a larger number of breathing disorders. OSA has a high prevalence, reaching about 33% of a metropolitan city2 and demonstrating the relevance of studying relationships branching from this common disease in the contemporary world.