I also have to say, this post has helped me a great deal understanding what has been going on recently when my eyes are closed. It first caught my attention while I was lying in bed which was just normal hypnagogic imagery, as it seems. However, it has started happening during the day as well when I have my eyes closed long enough. Little phosphenes appear but they also seem to occur in certain shapes, and I could swear that I have some control over them. I find myself to be able to produce really simple shapes like circles, lines or triangles. Sometimes, I also seem to be able to draw a line into a specific direction. I have never had any training, nor do I meditate properly. Maybe I get relaxed and sleepy enough during the day for hypnagogic hallucinations to manifest? Before I had any idea these phenomena even exist, I feared something might be wrong with me.