In one of my lucid dreams,i wanted to talk to the dream in order to increase the lucidity but i was unable to speak .the dream began to fade ,my mouth was wide open in my dream but i was feeling my real closed mouth.Then, after proceeding to the spinnin technique , i ve had a false awakening , prolonged my dream and didnt try to talk to the dream anymore.
P.S: talking to dcs works for me.