If I become lucid through realization that it's a dream I always have a niggling doubt. I know it's a dream but still don't chance it.

Like this morning I was walking up a hill. I'm pretty afraid of heights in real life and I realized I was dreaming. I still had a little vertigo and was unsure of just jumping of and flying away. I had to do a little floating reality check just to be sure I wasn't going to die, lol.