good idea.
I had one lucid like this once. not my head but i was staring at my hands to try and stabalize my dream and as i was moving my hands i realized that my right hand was not attached to my body. in fact i was holding this hand with my actual right dream hand, but untill that point i had been thinking that it was my actual dream hand. it was pretty suprizing and i dropped it. as it was laying on the floor i still had complete control of it and could feel with it as well as my other 2 hands that were where they were supposed to be. so try removing some body parts painlessly or growing some extra limbs.