[godshatter]

I'm guessing the added visuals come from hypnagogia, the state between waking and sleep where you can see imagery related to dreaming. I'm especially aware of this state because I have aphantasia and thus have no other method of seeing imagery in my head that doesn't pass through my retinas first. I've seen it when I thought I was awake, but later realize I wasn't fully awake. I also used to dabble in lucid dreaming, and spent a lot of time trying to ride the line between being awake and falling asleep. I'd suggest learning how to lucid dream, because that's another environment where you can be visually creative.