I do not see anything while dreaming. It is a constant source of slight anxiety as I can be quite conscious and the blindness is puzzling. In daily life I can project myself in some mental space (ie my kitchen) and perceive where the boundaries of things would be, but none of this process has anything to do with vision of sight. It's more like extend proprioception.

If you place your hand on a wall, then close your eyes, then remove your hand, I suspect you'll still feel where the wall is. Even if you picture something completely different in your head, the wall is still there I suppose? My guess is that my extend proprioception (or whatever the right name for this would be) is more fine tuned and apt than someone with a mind eye, but I can't really know. :|

I also do not hear sounds while dreaming, but then again I don't really have an inner monologue anymore, that went away at the same time I learned programming and I don't think it's a coincidence. I do verbalize in my head when reading conversation-like stuff (HN, slack, etc.), but you won't catch me with any internal monologue while reading ingredients, jira tickets, etc.

While dreaming, I can have conversations but there's no gradual arrival of content, it's instantaneous, it was not yet "said" or it was.

This is wild! When I dream it feels nearly indistinguishable from conscious life. Full color, sounds, pain, fear, people - weirdest of all is when people in my dreams solve problems that I can't solve, like math problems. Really trips you out because it's all in your brain, and "you" were the one that also solved the problem. I chalk it up to the solution also being incorrect but feeling correct in the dream, otherwise it would be quite terrifying.

I’ve definitely done math in a dream, checked the answer immediately upon waking, and it checked out. My brother reports the same. He also claims to exclusively dream lucidly.

I have Aphantasia. I cannot recall any sensoric input, be it visual, audio, taste, smell, touch. I have an inner monologue. I rarly remember my dreams, but when I do I now I saw something. As for hearing I cannot really answer it. Currently I do not think that I hear sounds while dreaming. I can talk with people, but I believe everybody sounds like my inner voice. Again, it is really hard to tell, since I cannot recall it.

I do see images and hear sound when I dream, and when I daydream! That is interesting, isn't it? I have always thought so. So, maybe it's like that unconscious memory crystallization subsystem works, but the conscious recall subsystem doesn't work quite right. I suspect that these are two quite different things, though I don't really know.