How unconscious I am when dreaming depends on how single-minded my consciousness is when awake.
Some days, or some years, I'm especially pig-headed and my mind accumulates great weights of unresolved problems and unexplored possibilities. Then, at night, the dreams take firm hold and randomly smash all these unrelated things together to play out the weird results. Upon waking, I want nothing to do with that nonsense, and forget it.
Other times, if my waking mind is free to drift foolishly and brave to face any issue, I have little material for abstract dreams, and so I go through all the proper sleep cycles without getting lost. My train of thought just plods along rationally overnight, and I wake feeling cheated that I spent a whole night "dreaming" about backing-up my hard drive and revamping the directory structure, or something equally mundane.
With all my dreams, lucid or not, I wake immediately before a certain threshold of feeling. I believe that protects my waking mind from becoming overly imprinted by a dream conclusion.