You remember a lucid dream, like said above, like in real life USUALLY. Also USUALLY you remembered you controlled it. When your in a lucid dream its like your in real life, although the vividness can be bad. Also, as stated above, dream control can vary from person to person and if you think you can do one thing then usually you can. For instance, If you think that if you jump off the building and can fly then you will. If you think that you will fall then you will fall. Its a matter of the mind. In a dreams its created 100% by your mind. So lucid dreams are only limited as your mind can take you. Any other questions? Also if anyone sees anything inaccurate in this post don't be afraid to mention something xD.