First of all, What is it? (source Wikipedia):
A lucid dream is a dream in which the person is aware that he or she is dreaming while the dream is in progress, also known as a conscious dream. When the dreamer is lucid, he or she can actively participate in the dream environment without any of the limitations that otherwise would feel natural to persons who incorrectly believe they are in the "real" waking world. Lucid dreams can be extremely real and vivid depending on a person's level of self-awareness during the lucid dream.
I dream theese kind of dreams every night, I feel physical pain in the dream and I am able to control them while I sleep. Pretty fun to have my own dreamworld in one way. You can meet anyone you like and do whatever you want. No limitations. My favourite thing to do in my dreams is to fly.
Do you have realistic/lcid/controllable dreams? And what is your favourite thing do dream of/do as you are dreaming?