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In multivariate analyses, short sleep duration every night at baseline predicted anxiety disorders at follow-up, controlling for anxiety at baseline. Examining the reciprocal association, anxiety disorders at baseline did not predict short sleep duration at follow-up. We are the first to examine the reciprocal effects for anxiety disorders and sleep duration among adolescents using prospective data. The data suggest that reduced quantity of sleep may increase risk for anxiety, but anxiety does not increase risk for decreased sleep duration.