It's understandable that many ghost and alien spacecraft sightings are reported as having taken place at night. The human brain is constantly trying to make sense of incomplete shapes and objects and the result is often the creation of one's imagination. It's the same phenomenon as seeing faces in clouds and a multitude of things in ink blots. And religious experiences tend to be based on the deity we have been indoctrinated with whereas there have been thousands of them in the history of mankind. The nature of perception is fascinating and often says more about our internal world than the external.