I've read about cotard delusion where the person affected believes they are dead or do not exist. I know I don't have this problem but I do suffer from dissociation and that in turn causes depersonalization from time to time. But to my point, one of the times that I was hospitalized one of the things they said I was doing or saying was how everyone was dead and that everyone of the living people that were around me were automations or non-living but still moving people. I don't know if that makes sense but I just would like to know what the heck that was and why no one seems to think much of it.