Well, it often happens in my FAs.

It usually happens when I'm not very lucid so that must have something to do with it.

My dreamsign and RCs usually are induced when I wake up in my bed and I can't move. This is how I usually know it's a dream because I don't often wake up not able to move. =P

Anyways, my last LD was dumb and I had very little lucidity. It might've been because I was much too tired when I attempted and my affirmations were half-hearted.