title: Conclusion: challenges in the comorbid condition.
authors.forename: Thomas
authors.initials: T
authors.lastname: Roth
mesh_terms: D015897:Comorbidity; D003863:Depression / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D003866:Depressive Disorder / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D006801:Humans; D017286:Polysomnography; D007319:Sleep Initiation and Maintenance Disorders / Q000453:epidemiology* / Q000523:psychology; D012895:Sleep, REM