I've told this before... One day while practicing on a 20 yard target inside the big steel building where we made arrow shafts, the power went off. Pitch black in there. On impulse (and knowing where everybody was) I continued to shoot based on the lingering image in my mind, and grouped the rest of the arrows with the first shots. I was totally concentrating on "feeling" my form and the memory of my hold on that target, which I shot a hundred times a day. Shooting in the dark was illuminating. I think shooting form and consistency rely very deeply on "muscle memory". It changed the way I practice, striving now for the most realistic and varied shots as I rove, giving my muscles as much memory as I can, I suppose.