Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Objective: The aim of the present study was to assess sleep patterns in the adult population of the city of Campinas (Brazil) according to socioeconomic/demographic variables, chronic diseases, and symptoms. Methods: A population-based cross-sectional study was conducted using data from the Campinas Health Survey (ISACAMP) carried out in 2008 and 2009. A total of 2637 individuals aged 18 years or older (obtained from a probabilistic sample) were analyzed. Associations between sleep pattern and the independent variables were determined using the chi-square test. Multinomial logistic regression models were used to adjust for confounders. Results: The prevalence of six or fewer hours of sleep was greater among individuals aged 40 years or older and among divorced or single individuals. The sleep pattern of nine or more hours was more prevalent among those with less than 40 years of age, among those who were divorced, or single, among those with a lower level of schooling, those who did not work and housewives. Both short and long sleep patterns were more prevalent among individuals with heart disease, vascular problems, rheumatism/arthritis/arthrosis, osteoporosis, or emotional problems. The prevalence of the short sleep duration was greater among individuals with back problems and those with three or more health conditions. A strong association was found between sleep duration and sleep quality. Conclusions: Socio-demographic factors and health diseases were associated to sleep duration. This issue should be considered in health promotion strategies. (C) 2011 Elsevier B.V. All rights reserved.132139144Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Ministry of Health and the Secretary of Health of Campinas [4300]Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)