I only mentioned ventricles because I had read that people with schizophrenia often have enlarged venrricles.

I'd be curious to know what physical illnesses could cause hallucinations. I haven't been feeling sick in any way but that may not mean anything.

My hallucinations don't seem to happen when I'm doing more they seem to happen when everything is quiet and calm and especially at night. Maybe they happen when it's noisier at work too and they don't register. I almost never get them in the morning though. Unless you Count the early am hours when I'm still awake from the night before.