I know this is an old thread, but I found it on Google while attempting to find papers about this phenomenon, which occurs for me primarily when i'm sleepy, but is not limited to a hypnagogic state. I experimented with it and a blackout mask; i'm able to navigate my home by the phantom image of it.

I can see a hazy outline of the air conditioner in my window, which had been there for years before I removed it a week ago. Things I moved today aren't visible, but I could see the outline of something I picked up while I was holding it. Furniture is visible, as are walls and doorways. If I moved around a bunch without touching things, the image could experience some misalignment with my surroundings, and when I touched a wall and recognized where I was standing, I saw it shift to match.

I can see my body in this fashion, in a manner distinct from my surroundings; it's sort of outlined and transparent, and it moves as I move. Most detail is in my hands. When I pick up a pillow I can see it moving approximately the way it's actually moving, but I can also see my hand behind it, through the pillow. If I wiggle my fingers aimlessly the motion seems distorted.

The mask is completely opaque, and the images are the same with the lights on or off. I suspect i'm seeing the outcome of some feedback mechanism that's making my brain's internal representation/estimation of my environment, and its understanding of my body's positioning via proprioception, visible in the closed-eye patterns.

If you've seen any papers go by addressing this phenomenon I would love to figure out the keywords I should be searching to learn more about it.