I had a lucid this morning where I asked my dream which elements I had the ability to manipulate. I closed my hands together, and told my dream that if I could bend water, my hands should light up when I open them. And they did. Same goes for fire, and slightly with earth. But no matter how much I tried to convince the dream I could manipulate air, my hands just wouldn't light up. No matter how much I tried to airbend, I just couldn't.

P.S. I pushed my arm forward with my hands closed into fists, and I firebent! It was the most awesome feeling ever, it was vivid and I could feel the force coming out of my arm into my hand and finally turning into fire.