Too tired for school? The effects of insomnia on absenteeism in adolescence

ObjectivesSleep has important consequences for a person's daytime functioning. Numerous studies have shown that insomnia predicts work absenteeism and work disability in adults, but only a few studies have examined this association in adolescents. This study aims to explore whether symptoms of insomnia in adolescents predict school absenteeism 1 year later, over and above known psychological risk factors for absenteeism.DesignThe study used a longitudinal design with 2 measurement points over 1 year.SettingThe students completed questionnaires during school hours at baseline and again at follow-up.ParticipantsStudents in the 10th to 12th grades in a Swedish upper secondary school were followed prospectively for 1 year (age, 16-20 years; N = 353; 48.1% girls).Measurements and resultsWe used logistic regression analyses, controlling for the known effects of psychological factors, and arrived at a model elucidating the role of insomnia. That is, besides symptoms of insomnia, the model included previous absenteeism, alcohol intoxication, school-related social phobia, social anxiety, depressive symptoms, somatic symptoms, and bully victimization. Symptoms of insomnia predicted school absenteeism 1 year later, over and above known risk factors for absenteeism. Adolescents reporting severe symptoms of insomnia were almost 3 times more likely than adolescents reporting no or low symptoms to report problematic absenteeism 1 year later. We did not find any gender difference.ConclusionsOur findings underscore the importance of sleep problems on adolescents' daytime functioning as measured by school absenteeism. Therefore, sleep may be an important target for preventive interventions with adolescents.