The Nightmare, by Henry Fuseli (1781) is thought to be one of the classic depictions of sleep paralysis perceived as a demonic visitation.
Sleep Paralysis Causes.... are real, but it feels as though a demon is possessing your body. ...I hated it for others, but I was also glad I was not alone in feeling this way. I still cry on occassion.
I LOVE THIS!! It makes me so angry that people think Narcolepsy isn't serious...