english: People with certain mood disorders and PTSD often have difficulty sleeping, leading some scientists to believe that lack of dreaming may be a contributing factor to their illnesses.
non_english: Ljudi s nekim poremećajima raspoloženja i PTSP, često imaju problema sa snom, zbog čega neki naučnici veruju da bi nedostatak sna mogao da bude dodatni razlog za njihove bolesti.