I read a story in a book that there's no need to be afraid of ghosts or sounds, ghosts only stay at earth if they won't want to accept they are "dead". ghosts can't hurt you it but it can come to you if you are very sensitive for it and something can appear because you are imagining it or it can be history that's repeating itself.
If you are dead you go to some sort of healing centre where you will recover from all the bad things you had in life. if you are fully recovered you go back to earth in another body and have new experiences and you've forgotten all the things that happend in your past life. what you also have is some sort of guides what people call "angels" but I call it guides and they'll guide you with most of the things you do or want to do. guides do not like it if they call them superman.
I can understand that people are scared for such things if they don't experience this everyday. This was my story.