Hi Fairy. I was just reading today how full the unconscious is in comparison to the conscious mind. I do believe you can get messages in dream state but one thing that tends to make us not hear the messages could perhaps be a belief that we cannot get messages of a positive nature within dream. Just a thought. I noticed over the years I started looking more and more to dream state for answers to various questions I had; this looking and focusing on the dream yielded up some amazing messages which fit with my current questions and since I only focus on the positive, thats whats I get back in my seeking. I'm like you though, I can hear voices now and then, but translating them into what is being said is a different matter and takes time; I think this is so as the brain understands language perfectly, our physical brain, but when the mind is dreaming, its another dimension and is not so concerned with precise sentence structure and language fundamentals as it is with the communications of the spirit and using entire ideas and belief systems, like a rote, we call it here, or like a picture has a thousand words.
hope that helps a little.