To the Editor:— I was interested in Dr. Schneck's excellent article on Henry Fuseli (207:725, 1969). "The Nightmare" is, of course, his best known work. Dr. Schneck has argued convincingly that "The Nightmare" represents the well-known clinical syndrome of sleep paralysis. Critics of Fuseli's work, eg, Sacheverell Sitwell, have also commented on the quality of "static horror" that they project....