“Being ridden by the witch” is the southern Americana folklore term for sleep paralysis. There are many more folk legends worldwide. In Fiji, it’s kana tevoro, or being eaten by a demon. It’s sometimes cultivated there with shouts of kania! kania! ("eat! eat!") from persons watching the victim in an effort to prolong the experience and enable communication with the dead. In Turkey, it’s the djinn (another demon) strangling you in your sleep and is only remedied by reading passages from the Qur’an. In parts of China, it’s a mouse stealing your breath. In Catalan folklore—of pooping Christmas log fame—it’s a giant dog or cat that enters your room and sits on your chest while you sleep. (Catalan folklore is the best.) But, usually, it’s some variation of witch or demon suffocating and otherwise torturing the victim.