Last night, I managed to come extremely close to acheiving lucidity. In my dream, I was doing something completely nonsensical, and I managed to ask myself if i could indeed be dreaming. I tried to plug my nose and see if I could still breathe through it. It seemed like I could a bit at first, but when I tried to do this again, the test kept failing. I was in a reasonably plausible situation when I was doing the reality tests, so I thought that maybe I wasn't dreaming. I was not completely buying that I was awake, but after several other failed reality checks, my mind began to wander and I slipped back into the dream.

I had basically acheived complete lucidity, but because my reality checks were failing, I lost it. What is the best way to make sure when you are reality checking?