You notice absurdity in dreams with your "mind", which is already corrupted. E.g: you are conjunction-fallacy-man, see something in your dream, which works according to the math, find it absurd, wake up. Sure, active LD practice can increase your awareness, but I cannot see non-neglible result if you are already rising your sanity waterline with some CFAR-ish technics. If previous statement is false, then lucid dreamers are already more rational than general population. I haven't seen evidences for this hypotesis