From reading the thread I think
@Edward Current's theory is possible for some cases, but if so, then it's an undiscovered phenomenon.
I don't know if that could be caused by the DMT produced in the brain, that would have to be demonstrated in some way.
Let's forget the "distant dots" misinterpreted by many inexperienced skywatchers (and some experienced ones) for a second.
If we take those "incredible experience" cases, with lots of details that seem "alien" or "high strangeness", then we have the following prosaic explanations already:
- hallucination due to stress
- hallucination due to psychosis
- hallucination due to mind altering drugs
- "genuine/good faith" hoaxes, and simply embellished memories (people who want to believe so desperately that convince themselves they've seen something extraordinary when they didn't)
- real hoaxes (liars, for money, notoriety, being accepted on a community)
- real weird planes and experimental classified aircraft (no anti gravity here, just unusual planes)
I've met some people with crazy experiences who do not believe in aliens, stories, and generally don't care about the subject (but note, they're not usually skywatchers either).
If those people were not hallucinating and were not totally inaccurate with their description, then I don't know in which category of the above they could fall in, as some of them really seem genuine in their experiences.
I see why some FBI reports in UFO cases say "the witness was credible", because some witnesses are credible.
But then there is almost no way to debunk and figure out exactly what they saw.
Especially if there's not real evidence to corroborate their sighting, like videos and photos.
My personal idea is that unless you're dealing with a crazy religious alien believer, then a single "hallucination" in the brain has to be explained and somewhat taken more seriously if they never experience anything similar again in their lives.