The only thing I have in terms of waking up in middle of the night is that I seem to see hexagon honeycomb patterns of RGB lights..... not kidding. They're like phasing in and out. Really makes me think of a visual screen, lol. If I push on my eyes they move.
I heard something a bit like that, once when I was 11, and I was waking up after being knocked out by a trampoline. Only time it happened though, and it was spinning triangles filling my vision.
