.A hag, or "the Old Hag", was a nightmare spirit in English and anglophone North American folklore. According to folklore, the Old Hag sat on a sleeper's chest and sent nightmares to him or her. When the subject awoke, he or she would be unable to breathe or even move for a short period of time. In the Swedish film Marianne, the main character suffers from these nightmares. This state is now called sleep paralysis, but in the old belief the subject had been "hagridden".