| Resumo: | Background: Several studies have shown that overweight and obesity is associated with sleep disorders. Aim: The aim of this study was to determine the association between sleep disorders and overweight and obesity in Portuguese adolescents. Methods: In a cross-sectional approach we assessed 7136 students from twenty-six schools of the district of Viseu, Portugal. The overweight and obesity was evaluated by the body mass index (BMI). Insomnia was defined based on the DSM-IV criteria, as the presence of one or more symptoms:difficulty initiating sleep;difficulty maintaining sleep;early morning awakening and difficulty getting back to sleep;non-restorative sleep. Results: The prevalence of overweight and obesity among the adolescents is 32.9% (higher in male gender 37.9% vs. 28.6%,p<0.001) and 4.7% (higher in male gender 6.7% vs. 2.9%,p<0.001), respectively. The prevalence of symptoms of insomnia is 21.4%. Insomnia is present in 22.4% of adolescents with overweight and 25.5% with obesity. Insomnia is associated with overweight (OR=1.32 95%CI1.1-1.86) and obesity (OR=1.11 95%CI1.0-1.30). Among the female gender insomnia was associated with overweight (OR=1.2 95%CI1.0-1.43) and obesity (OR=1.64 95%CI1.2-2.78) and also among the male gender (overweight,OR=1.31 95%CI1.1-1.71 and obesity,OR=1.62 95%CI1.01-2.61). Conclusions: The association between sleep disorders and obesity has not been fully clarified, however, several studies predict that the association is bidirectional.
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