Sleep Paralysis explores a distinctive form of nocturnal fright: the "night-mare," or incubus. In its original meaning a night-mare was the nocturnal visit of an evil being that threatened to press the life out of its victim. Today, it is known as sleep paralysis-a state of consciousness between sleep and wakefulness, when you are unable to move or speak and may experience vivid and often frightening hallucinations. Culture, history, and biology intersect...