I went to the gym today and I came across a person who works at a hospital. He told me the nurses were afraid of going to certain levels of the hospital.
The thing is, certain sections of the hospital have been closed down and they are not public anymore.
The nurses are afraid to venture out for supplies by themselves, for each time they heard noises. Elevators were going up and down without an occupant, and there were inexplicable electrical problems as well.
The man on duty placed a mobile phone in one of the wards and pushed the record button. As he listened to the recording, he heard conversations, Bible verses being read aloud, screams, crying, and singing. The noise was overwhelming.
I believe these apparitions are not spirits, but rather the residues of memories left behind by the dying. Their emotions, drained into the walls and furnishings of the hospital, linger long after they have gone.
I think if emotions are very intense, they can be left behind in the physical world and they somehow interact with the environment and you can sense them.
But he also told me that some patients went crazy after spending some time at the hospital. I think they just could not process those emotions left behind by other patients.