To respond to your one statement, your conscious and subconscious communicate all day. Constantly. Almost everything that comes to your conscious has been subconsciously processed thoroughly already. Like what you see. Not only could you write a paper on what your subconscious does to your vision before it reaches your conscious, but there is so much it does you could teach a course over it. You could make it your life's work. That doesn't include everything else it does. It's not just something that happens when you're asleep. However, when you are asleep, it is very possible that your subconscious allows more information in. Instead of giving you subconscious data A, B, and C, it gives you subconscious data A, B, and D, and you construct resulting dreams.