Does this happen to anyone else? Is there a name for this so I can research it?

What I mean is this and it only happens sometimes. When I close my eyes in bed, images will flash that are as vivid as a dream. Most often, there are many images most of which I don't remember. I would guess that there are about five images per second, usually some geometric structure or something bearing resemblance to text but I can't read it because I can't stop the barrage of images.

It's actually kinda cool. I don't want to stop this phenomena...just want to try to understand it more and what it might mean.