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- Sleep quality and mental healthPublication . João, Karine; Jesus, SaulSleep is an essential behavior for life and obeys to a complex biological, psychological, social and cultural process with multiple implications in the quality of life of individuals. Sleep quality has been investigated dramatically in the past 20 years because of its role in the physical and mental health of clinical populations, as well as, in the search of more normative values in non-clinical populations. Still, although there has been an increasing interest on the implications of sleep on health, the empirical evidences with non-clinical populations are almost nonexistent. These investigation´s main objectives were to analyze the impact of sleep quality on the depression, anxiety and stress (mental health indicators) of a non-clinical population, and to evaluate if the relationship between these variables is moderated by gender, age and country of origin. A total of 1552 participants from three different countries (Portugal, Spain and Brazil) answered to a questionnaire with two different validated instruments which measure sleep quality and mental health indicators. The obtained results confirmed the initially proposed hypothesis. We attested that sleep quality has a significant impact on the mental health indicators. As well, we verified that the relationship between sleep quality and the mental health indicators in study (depression, anxiety and stress) is only moderated by the country of origin. In accordance with our main results and conclusions we outlined some strategies to promote awareness and early interventions on quality of sleep, targeting the specificity of each population/individual.