When you first hear a sleep paralysis story, it can be all to easy to dismiss as something fake or all in the teller’s mind. You wake up. You know you are in danger. An intruder is after you; the water is rising above your head; an evil creature is sitting on your chest and crushing the air out of your lungs. You need to escape, but you can’t move. You can’t even scream or call for help. Could it have been real?