One of the books which I am currently reading my way through, is "The Dream World of H P Lovecraft" written by Donald Tyson and published by Llewellyn Publications, Woodbury, Minnesota. 2010. ISBN 978-0-7387-2284-9.
Howard Phillips Lovecraft (1890-1937) (click here to take a look at the Lovecraft archive) was an American fiction writer who drew inspiration, among other things, from his detailed recall of his own dreams, which were frequently of a lucid nature.(To read about lucid dreams click here.)
Lovecraft created his own mythology as part of his story telling. Part of this mythology involved numerous alien races visiting the Earth, some of which "...rely on the magic of wizards to breed with mortal women and produce hydrid offspring who will aid them in their purposes..." (p.134.)
"The inherent power of Lovecraft's modern myth of alien-human hydrids cannot be doubted when you see it arise spontaneously in the form of UFO abduction accounts.
One of the central themes of the modern UFO mythology is that the aliens who visit our planet are breeding hybrids with the human species. Women abducted by aliens are sometimes impregnated by them, and men abducted sometimes have their sperm extracted.
Abductees are allowed from time to time to see the hybrid babies of this alien breeding program. There are half a dozen speculations by UFO experts as to why these hybrids may be being bred, but the most interesting with respect to Lovecraft's story "The Dunwich Horror" is that the aliens know of some future event or condition that we humans in our present nature could not survive, and they are breeding the more hearty hybrids to withstand and survive this future ordeal." (p.136.)
To read more on alien hybrids take a look at this or this.
Don't forget that all of Lovecraft's mythology proceeded Kenneth Arnold's 1947 sighting by many years.