God, this used to annoy me so bad. I'd read the same three paragraphs over and over again, only for my mind to wander immediately every time. I've since come to appreciate it though, because my mind usually wanders off to think about potential scenarios in the book I'm actively reading.

Like what two characters might say if they were to have a conversation about something specific, or even how the current situation I'm trying to read about might progress (instead of just focusing on the damn words that give me that answer, thanks brain). Time spent daydreaming about a story I enjoy isn't time wasted IMO.

Though, it's admittedly still very annoying when I'm trying to read something boring like a science or news article.