YES! I have total Aphantasia, (sight, smell, hearing, etc) and I cannot now, and have never been able to conjure up any image of literally anything. For 66 years I never in my wildest dreams had any inkling that the majority of humans walking the planet could actually call up images and other sense's input from their memory! BUT... As you said, when I'm right on the edge of nodding off, sometimes (very infrequently) I see shadows in my closed eyes of geometrical patterns slowly moving and re-arranging themselves. I have absolutely no idea what or where that is coming from, but at this stage of the game, I'm happy to "see" anything at all, especially something like this that seems to actually help lull me all the way to sleep.

What is so frustrating...when I am very tired and relaxed, and finally do see images instead of just black, I can't help but be a little excited, which makes my brain become more alert, and as a result, the images quickly fade away. But when I somehow manage to NOT get excited, and remain very relaxed, I quickly fall asleep. It's hard for me to stay in the doorway between wake and sleep. Too awake, or too relaxed...the door closes and it's all over.

There's an article by Liana Scott elsewhere on this site that describes her similar experiences with the in-between-state from sleep to wakening You might find it interesting: https://aphantasia.com/article/stories/hypnopompia/ I'm an aphant, but I don't have these types of visions. I dream, but without visions. But apparently many people with aphantasia have visual dreams, even though they don't visualize while awake. So, even among people with some traits in common, there is a lot of variability with respect to other traits.

Yes, that is absolutely same for me.