In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Ghost
If you dream of a ghost then you must be careful in two areas: your finances and your relationships. It’s very possible that you will be tricked with a purchase you make – paying more than is necessary – and will have a lot of trouble paying it back. In your love life you may find yourself unable to decide and emotionally confused.