A few nights ago I had one of my best lucid dreams, but during the lucid part of my dream I felt something against my nose. When I woke up, I was laying on my stomach with my nose up against my pillow with a lot of pressure. The feeling transfered into my dream causing me to be lucid.
Perhaps, use of tactile (sense of touch 
) sensations could be used to induce lucidity, since I clearly something on my nose during my dream.