If dreamed you that you lie on a floor, then in real life you are frightened by ruin threat. Show endurance and will power, then everything at you will turn out. If in a dream you see a wooden floor, then internally you aspire to simple natural life in a unification with the nature. To see a parquet means that you appreciate material prosperity. A concrete floor or covered with linoleum means that your opportunities not always correspond to your desires. If, having woken up, you cannot remember what was a floor, then in reality you attach bigger significance to cultural wealth, than material.
Be sure and keep any other thoughts out of your mind before drifting to sleep as a cluttered mind can decrease the chances that you will remember your dreams upon waking. Also, focusing on remembering your dreams upon waking in the morning is another very important thing. This sounds very easy, but is often hard for some to do. Interpret a dream by "dictionary dream of interpretation"
When you very first wake up, simply think about your dreams. Don't allow your mind to drift off to other things, just lay there and think about the things you dreamt about the night before - dictionary dream meaning.