I've had a few of these lately. I think it might have to do with LD's being so deeply ingrained in our subconscious after getting so involved.

I have reoccurring dreams where I literally tell a DC, "Don't worry, I'm dreaming."
After saying this I go about my random non-lucid business.

Makes a really frustrating 'Wait, WHAT?' moment upon waking. :p

Makes me question the clarity of the line we define as lucidity.