When I think of "reality" I find myself unable to escape the perception that a reality has to have some connection with both time and space, which then implies that when you dream you are observing a whole new world which is affected by time and exists somewhere in the universe. I am aware that such thinking is probably very flawed - reality probably doesn't have to mean time and space. However, I still think dreaming is a kind of hallucination, and lucid dreaming is the ability to control a hallucination. Not that that is a bad thing. It depends on what you would define as "real".