The one obvious connection between all of these things is that they seem to be the result of sleep paralysis. The other connection is that they are all images that would have been a major part of the culture at the time. In the religiously-paranoid Middle Ages there was great fear of demons, and later of witches. People talked about them everywhere. Today, our culture is filled with images of aliens and spaceships.
Visions are in keeping with the times.
But this still doesn t explain why the vast majority of alien abduction accounts are the same the same events, the same aliens. This image has been on the cover of countless books, in TV shows such as The X-Files , Dark Skies , and Roswell , and in movies including Close Encounters of the Third Kind , Independence Day , and Fire from the Sky . If you see, hear, or tell yourself something enough you eventually believe that it s true. Only it s happening inside the mind, not outside. They ve literally created reality.