Dreaming of having a lucid dream

I've only had 2 lucid dreams in the past year that I've been trying. But last night something strange happened. I had a dream that I was lucid dreaming and for some reason I didn't even realize I was dreaming! Has this ever happened to anyone? I don't understand how I could be obsessing and then "having" a lucid dream in my dream and not know I was dreaming. This honestly makes no sense. Any ideas ?