Morales-Munoz I, et al. - The authors investigated the differences in sleep functioning between subjects with seasonal affective disorder (SAD), alcohol use disorder (AUD), and SAD+AUD. This population-based study demonstrated that compared to controls, SAD and AUD, those subjects with SAD+AUD reported the highest levels of subjective sleeping problems. These findings proposed the relevance of examining the comorbidity of SAD and AUD when studying sleep functioning in these groups of patients.