So I've been having these strange sleep states lately when I take naps.

Sometimes I'll just be laying there and I will start to see an image, a scene or sometimes some kind of experience that I have had repeatedly lately(I found myself drinking out of this big cup of water that I almost always drink out of a few times). Sometimes these will become dreams and often when they do I am aware that I am dreaming immediatly, though I don't have much awareness or any control. I find that if I anticipate these dreams, the image vanishes and I'm just laying there in bed with my eyes closed again, but if I don't think about them then they can unfold. Is this in anyway an induction technique or related to one? I don't think that this is what hypnagogic imagery is, but I don't really know much about HI.

I've also been having this other experience where I will be sleeping and a normal dream ends and I don't wake up, then while in a dreamless sleep I become aware of my thoughts and realize that I am am sleeping but not dreaming. When I find myself in this state I can start visualizing something, like a memory, and when I start to get visual I can enter into a lucid dream in this scenery. The problem is that in this state I'm very aware/affected by sleep paralysis and I can barely even move. Is this "dremless sleep" actually dreamless sleep, or is it possible to have a dream with no visual?