The best known author of the cosmic horror story and the origin of the Cthulhu Mythos, Howard Phillips Lovecraft (1890-1937) is considered perhaps the greatest of all horror fiction writers… An antiquarian eremite, he was more fond of books than of people, very much like most of his protagonists. There is, however, no official record of Lovecraft ever encountering anything corporeally eldritch, as much as some fans wish it were all true. To this day you can find at least a half dozen different fabrications of Lovecraft’s wholly fictional Necronomicon. He credited his night terrors with providing most of his inspiration; both night terrors and the filmy, oily membrane between waking and sleep factor heavily in his various works.
Further reading: Catalog of Lovecraft’s works online