Imagine you’re lying awake in bed when you sense a presence in the room. There’s something moving in the dark. “Who’s there?” you try to ask, but you can’t move your lips to speak. The figure approaches and as you begin to make out the figure, you realize it’s not human. Terrified, every fiber in your being wants to get up and run, but your body won’t move. You desperately try to scream for your life, but you can’t make a sound. There’s no escape.