I've always had that problem, that's why I struggled so much through school. I've only managed to read two complete books my entire 59 yr life (Sadly nether one is the Bible ), Moby Dick, and, The Call of the Wild.Man, you too? I used to be able to eat a meal, watch the football game and play chess at the same time but no more. Reading is boring to me. I have dozed off many times reading.
Let me ask a question of you two guys. When you are reading, and your mind wanders, do you find you have still been reading but do not remember what you just read? I will have read about three or four paragraphs and realize I didn't even understand or remember what I just read.
But like you my mind wanders then I fall asleep.