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Morningness–eveningness and treatment response in major depressive disorder

In a large, prospective, 8-week open study of 721 outpatients receiving agomelatine treatment for a current major depressive episode (MDE), morningness–eveningness (Composite Scale of Morningness) was assessed before and after treatment to investigate possible changes in morningness–eveningness after treatment and evaluate whether morningness–eveningness at baseline predicted treatment response. A change towards morningness was observed after treatment. This change was greater in responders than non-responders. Moreover, being a morning type at baseline was an independent predictor of response to treatment. Once thought to be a trait variable, morningness–eveningness is a potential treatment target that should be systematically assessed in MDE patients.