”Beyond the Wall of Sleep” by H. P. Lovecraft

"Beyond the Wall of Sleep" is a science fiction short story by American writer H. P. Lovecraft, written in 1919 and first published in the amateur publication Pine Cones in October 1919. The tale tells of a former inmate at a mental hospital for the criminally insane, who claims to have been driven to violence following a series of deep and strange slumbers, in the Catskill Mountains.