Lucid while taking a nap; I've never had one this way.

The dream: I was in the street walking and singing when some friends popped up. One of them followed the lyrics of the song I was singing. After that we started talking about how big was the S4 a friend of mine have.
I was talking with one of them and doing weird things with my eyes and laughing when suddenly I did a RC, I don't know why, but I did it thinking 'I wish this was a dream' and I had 12 fingers. I did it again because it freaked me out, I couldn't believe that I was dreaming, it all felt so real. I said to my friends 'Omg I am dreaming' and started focusing on the scenery, looking the details for the dream to be stable and vivid.

The thing is that at this point I started to lose lucidity, as always, because one part of my brain is thinking 'my body, my real body is now on my bed' while I'm stabilizing the dream, and when I do this I start to feel my real body until I found myself awake, but I can't control that, I don't even know why.

Is this usual? I need advice on how to fix this. Thanks