I have had something like this and a bunch of other parasomnias for a while, one of which I haven't really come across in any literature and doctors seem to have no idea what I'm talking about, so I'll try to explain.

I can't do it 100% of the time, but I can enter a dream/unconscious state whilst being fully awake. Here's how it goes:

- first stage you start seeing light swirling shapes that can take various colors, believe this is called hypnogogic hallucinations, but at this point you won't make any sense or shape of them

- second stage these swirling shapes start to take form into the shapes of images, sometimes flashing between different ones

- third stage directly after this is the "exploding head" part that doesn't happen 100% of the time but right in between that hypnogogic boundary I get an incredibly loud buzzing sound in my head, accompanied by a deep sense of terror - almost like you get from sleep paralysis.

- fourth stage, once you get past that, you enter a light "dream" state where you start to feel like you can move your arms and legs and walk around, even if you don't see anything - it's a very weird sensation because you can still "feel" your physical body lying in the bed at this time. I believe this is when sleep paralysis is happening.

- fifth stage I am in a dream state and fully lucid. I can maintain that state for a while before either losing the dream and waking up or falling deeper into unconsciousness. What's odd is in this state I am almost always in a dream-representation of my house. 99.999% of the time. Initially my doctors thought this was when I was sleep walking, but cameras ruled this out.

I have a bunch of other parasomnias like sleep walking/talking and bed wetting stuff when I was younger. It's all related somehow, but no one really knows what's going on that I've talked to so far. It's kind of cool but can occasionally lead to crappy stuff like insomnia or poor quality sleep, or when I injure myself sleep walking. The only thing that's ever come up in a sleep study (which I struggle to take because in those settings I can't fall asleep normally) is that I enter REM sleep very quickly, almost like a narcoleptic, but that was never the formal diagnosis. Another thing that's happened in more recent years, ever since I experienced DMT, that I will occasionally have dreams where my sense of time literally feels like decades have passed. It'll always be super mundane stuff too, and when I wake up it's a really disturbing feeling.