You are taking this way too far. i have read the book 'DMT the spirit molecule', seen the movie, read many trip reports and seen alot of videos talking about DMT, i have also studied other psychedelics, studied psychology(neuro, cognitive, jungian, freudian and other general theories) and ofc NDE, ESP, dreams, consciousness etc. and theorized ALOT how DMT fits to this.
So what DMT actually does?
Well, it enhances the brain impulses basically. consciousness is basically created by brain regions talking to each other, ego(and how you experience the consciousness) basically works by leaving out the irrelevant(opposite of whats seen as relevant). So when DMT enchances the brain impulses, it does it so much that you become conscious of what you leave out, in other words your unconscious mind. your brains do shit loads of background processing that isnt normally communicated to other brain regions(so you never come conscious of it DIRECTLY).
There is this thing called intuition in your unconscious, which is basically unconsciously processing where something came from and where is it going and only thing of this that comes to conscious are the impulses to act on it or take the impulse as guiding internal perception that affects your thinking. now these intuitions normally only send the impulses when its seen as something really important(whwn it comes off stronger than conscious perceptions), but there are individual differences on how much people rely on intuition vs sensory info. some people get more hunches that something will happen etc. This is why there are so many mystics in the world. there is nothing supernatural about this, it just seems so to some due to highly subjective nature of the intuition and because people tend to leave stronger memory trace when it actually comes true. So DMT is enchancing the perception of these intuitions(and possible enchancing the intuitions created), leading people to make really vivid and realistic predictions about the future. This is why the pineal gland is seen as the 'third eye' by hindus, buddhists, ancient egyptians and afaik in alchemy. Even christianity has strong associations with pineal gland, the largest statue in vatican is a pine cone(ancient symbol for pineal gland, pope has a pine cone in his staff etc. But this is all left out from the bible and public. Tibethian book of the dead says that soul is created at the 47th day in fetus, this is also the time when pineal gland starts to develop. And for people who didnt know, pineal gland is what creates melatonin, and DMT is created from melatonin, still unclear if DMT is also made in pineal gland or not, or if melatonin is transformed into DMT elsewhere, nevertheless DMT originates from pineal gland.
Now when it comes to total disassociation from the world and auditory and sensory hallucination when taking DMT, also with the ESP. Like i earlier told that it enchances the brain impulses to a great degree. Human perception about external and internal world is really subjective, you could see it as taking some hints from eyes, ears and bodily sensations and creating a subjective world out of those that we combine and create the 'reality' from. Now there are two factors with this, the actual sensory information and the subjective experience created from those. When you take DMT both are enchanced. Enchancing the real stimuli will cause you to be able to react on much smaller stimuli, but enhancing the subjective factor will make you disassociated from the real world. Combining these two and not removing what is not(due to loss of ego) might make you feel like you are experiencing extra sensory perceptions, now remember that normally the real stimuli comes before the subjective factor. When you enchance both, the latter one you enhance is the subjective factor, leading the subjective factor coming on stronger than the actual stimuli, this leads to disassociation and unreal perceptions about external world(ESP), which nonetheless does have a link to reality, but is twisted.
Now when it comes to dreams and DMT, the link between the two is bit unclear. There are some major differences between the two. First of all, when you take DMT and its enhancing your brain activity, it also enhances the connections between the different brain regions. But when you sleep and dream, the activity stays local, in other words the regions get active, but they dont communicate with each other. But this might be explained by combination of DMT and for example melatonin(or other things).
Now when it comes to praying and meditation, they activate the pineal gland and somehow leading to greater understanding of the self(conscious and unconscious aspects of you). But with praying this isnt seen as getting to know self, but getting to know god. That is because with praying you are assuming that this 'creator' or god is in the external world, thus you are enchancing the experience of some external entity. But with meditation, you are concentrating on yourself, this leads to greater understanding of self, but the unconscious isnt projected to external world. So both praying and meditation is enchancing the unconscious, but with praying is projecting it and with meditation you are seeing this unconscious in you. And this is exactly what DMT(and other hallucinogens to lower degree) is doing, except that with DMT what you perceive is coming so strong and fast that its nearly impossible to get a proper grasp on it, not to mention that there is ALOT of irrelevant stuff perceived also that are left out in purpose.
Also this subjective perception that we normally perceive is due to conscious and unconscious memories and possibly by our genes.
Carl Jung had this theory of collective unconscious and archetypes coming from there. Collective unconscious is basically shared with all humanity and is like a genetic memory. But jung saw this in much more depth than todays science does. The definition is something like this: "Collective unconscious is common for all minkind. Structures within the collective are archetypes, archetype is a symbol(not just visual) producing structure.
Inherited parts of the psyche, structuring patterns of psychological performance linked to instinct(gut feelings that you feel urge to act on), hypothetical entity(those many gods for hindus for example, or part of the one christian god(i see christian god as a projection of unconscious(personal and collective) combined with consciousness), irrepresentable in itself and only evident through its manifestations(meaning that they come from unconscious and you can see the unconscious in indirect ways projected to external world or affecting your thinking indirectly).
Now when you are on DMT, you are also perceiving these archetypes and creating a audiovisual symbol for them(in regions that handle visual and audio perceptions). For example this ultimate judge that some people see both when they die and may see when they take DMT. Or elves, mirror image of self etc. that people might see and even interact with them. They might share some insight that you couldnt had perceived CONSCIOUSLY normally, but this insight is neither anything supernatural, its just something that was already processed(or already there in form of archetypes) in your unconscious.
Anyways if you think about the ego, ego is basically a structure in your consciousness. Carl Jung said that the ego has five major functions:
1) stability of personality. Your core personality stays reasonably stable over time(but ofc how you act may change dramatically, but jung didnt see that as part of personality).
2) Stability of identity. You wont wake up the next morning and feel that you are someone else.
3) Cognition. Process info consciously, problem solve and store information.
4) Executive functioning. You know to put tooth paste on toothbrush after you grab the toothbrush, not before. You know how to walk etc.
5) Reality testing. Expect and obey the laws of nat