The research found that Sleep paralysis is caused by that while we sleep, REM Sleep, the brain hormone secretion is there to inhibit the function of the muscles that make the body move can't move. In order to prevent the danger of the body during sleep and dreams. Don't let your body move according to the dreams, to reduce the chance that the body is dangerous during sleep. This hormone will disappear before the dream will end and it will stop the secretion of hormones when we wake up, where it is still running. At the moment we are going to wake up might be the cause of the ghost early.