My father told me about somone experiencing going to heaven and waking up in there body. The name of the book is "Saved By The Light". She heard that her husband was in a car accident and got so frightened that she passed away. Then she was talking to god in heaven and experienced everything in heaven. God told her its not he time to go yet. She liked heaven much more then Earth, that she wanted to stay. God sent her back to her back to earth. The doctors been told she was dead for 5 hours. She was fine and had no brain damage. This is very hard to believe that for 5 hours of deathness, you have not lost brain cells.