For most of us, fly fishing is a visual sport. We take in information with our eyes and adapt to it. For example: I just pulled my dry fly out of that trout's mouth - maybe I should try waiting a damn minute before setting the hook next time. Fly fishing for trout is hard enough with good visibility. For a long time, I assumed the buddies that fished at night were either looking for something stupid to do or avoiding something at home. Both may be true, but it's also when the biggest trout eat.