My first lucid dream that I ever tried to have actually happened when I was daydreaming in a dream. When I realized that I was dreaming I tried to anchor myself, but I messed up. I continued on in the first dream after that. Since the dream was actually a daydream of becoming lucid I thought for a while that it wasn't a true lucid. But I think that if at any time during your dream you think that you are dreaming, then that is a lucid dream. Whether or not you are sure exactly what is going on. A lot of times during LDs I think that if this is my dream then anyone I meet must be dreaming as well. That made me really confused as to why Harrison Ford wanted to kill me.