It may feel like biting a sponge to you, but I have a feeling that if I tried that it would feel quite real and I would wake up.

My first lucid dream was last night and its been a little over a month since first learning about lucid dreaming, and the reality check I used was plugging my nose and trying to breathe. I remember at first breathing then thinking to myself "Does this mean I'm asleep? Should I be able to breathe through my nose when it's plugged? Hmm... oh! No! Of course not! I must be dreaming!"

D