90% of the times when I become lucid (aware) in my dreams it is because I’m “using” a restroom.  I’ll be standing there, something won’t be “right” and I’lll say “wait, this is a dreampiss.”  I’ll then either wake up, or continue through my dream in a lucid state.

 I really wish my lucidity could be due to pure mental willpower, and self-awareness… but no.  I need to be in a bathroom.