I have been in contact with other "abductees" that had the same visions shown to them
Assuming it is not false testimony, people tend to have dreams influenced by their fears and beliefs. Lucid dreams happen, sleep paralysis can even produce short delirium-like realistic dreams where the sleeper believes to be awake. In this latter state, it is common for people to experience realistic nightmares about things they obsess about. It is apparently in this state that most who claim to have been "abducted" experience that delusion. Since it's influenced by belief, people also meet "angels" or "demons" then. Some also experience very realistic "out of body experience" delusions.
One of my personal experiences was a "Jesus visitation", where he made my "etheric body" stand up in the room, and told me "you're son of God". Of course, that "Jesus" looked just like the depictions in the Watchtower publications, and "being called son of god" is part of the Jehovah's Witnesses doctrine for its "annointed" group, citing a verse. I was raised in that cult. It's still a better experience than if I had been obsessed with aliens. But I also had apocalyptic nightmares, due to the fear mongering JW imagery and its claims that their Great Tribulation is imminent, perhaps tomorrow.
I'm also familiar with two types of "OOBE"s, one more dream like but very lucid, then the sleep paralysis much more realistic but shorter ones, in my case the latter usually happened after "waking up" from the former.
There are tricks to attempt to trigger these, like suddenly disturbing one's sleep schedule (i.e, wake up as if going to work, eat, then nap, so the mind is ready for action and vivid REM sleep is likely, due to an already rested body), dream recall/writing practice when waking up, cognitive tricks like practicing environmental/situational awareness several times a day, so it hopefully also happens when dreaming to become lucid, etc. We usually don't remember dreams except when waking up, then we typically perform common activities in them that we do in the day. So such tricks attempt to disturb the routine and to become aware when dreaming, become lucid and shape dreams, etc.
Strong personal experiences, even when seemingly realistic, are not evidence of communication with actual beings, or of actual access to special knowledge. Our brains are complex and unreliable enough to produce those, naturally.
But it's interesting and fun. One can fly, fight like in the Chinese films, change one's own shape... and there are funny artefacts, for instance long stories can be read out of a small text on a sign, the story resumes when reading the sign again... When climbing stairways, we can be just above the steps sliding... Our "clothing" can be "on fire", alternating fluo colors...
