I can't breathe. There's a tremendous pressure in my chest. I'm panicking, and then I realize I can't move. I try to scream. Suddenly, violently, I'm startled awake, sweaty, shaking, and disoriented.

Parasomnias are a fascinating group of clinical disorders associated with undesirable physical and mental phenomena that occur predominantly during sleep. They include sleepwalking (somnambulism), ...