Many a time I've tried to visualize, but I always see black. However, there is one particular setting when I can sometimes actually see images. When I am VERY tired, and I'm in that window between wake and sleep just before I actually fall asleep, my mind will relax, and sometimes allow me to see fuzzy images (usually ones I can't choose or control). When this happens, I am still awake, and I am NOT Lucid dreaming. However, these rare images usually don't last very long, because suddenly seeing images (instead of just seeing black) usually jars me out of that relaxed state where my brain becomes more alert, and then I'm right back to seeing just black again. Does anyone else have this experience?