My mind did wander, about 35 thousand times. But I am training myself to disregard the dreams and curiosities that come about as a consequence of me reading something. I've got a lot of things to do in this life, and in order to do them I must read a lot of things I don't want to, and also read a whole lot of things I want to in a lot more depth and intensity than I would prefer. I have great difficulty reading even things I want to read. Everything I read spurs my creativity(I start getting curious ideas that are infinitely more interesting than what I am reading), i cannot read passively like you watch TV passively. I have to constantly refocus.