I know some of you like @Nate_Pearson have/had deviated septums. I have one as well - for as long as I can remember I’ve mainly breathed through my mouth. If I had to breath through my nose while sleeping, I’d probably be dead. This leads to dehydration while sleeping and (from a recent podcast) in riding.
Sometimes I can breath fairly fully through my nose but this isn’t often. I still do try @chad’s advice to breath through both my nose and mouth during heavy workouts.
My question for those who have had surgery, was it worth it? I feel like I can continue living like this since it’s what I know, but how did it affect your life and (more importantly?) cycling performance?