There are many origins for this phenomenon. I will quote the late John Keel author of Why UFOs:
“…The real UFO story must encompass all of the many manifestations being observed. It is a story of ghosts and phantoms and strange mental aberrations; of an invisible world which surrounds us and occasionally engulfs us; of prophets and prophecies, of gods and demons. It is a world of illusion and hallucination where the unreal seems very real and where reality itself is distorted by strange forces which can seemingly manipulate space and time and physical matter…forces which are almost entirely beyond our powers of comprehension!”
This statement is valid, this phenomena goes beyond what is call physical matter and our concepts of reality. It is a mixture of strange creatures or entities, such as the Mothman, to Spring heeled Jack, to demons, and other strange and bizarre entities. The bible has stated we are dealing with “spiritual forces” and not just flesh and blood in this world. In many encounters with this phenomena reality of time and what we deem physical matter breaks down, to almost to the point of being magic.
It is not just a case of simple explanations for this phenomena’s origins, it may well lead into concepts of existence yet unknown and incomprehensible to us at our stage of development. The simple ET origin of the UFO does not fit in with some of the accounts that have been claimed. It could be a mixture of technological and spiritual forces at work in combination with each other…and even beyond.