I've been told I read fast. I guess that's true but nowadays I take such long breaks between when I'm actually reading it takes forever to read a book if it's not great. I remember in second grade I used to read 3 Goosebumps books a day. R.L. Stein was a god.
Same thing happens to me with the sleep reading. A page later I realize I was off on other things and have to go reread what I just read but wasn't paying attention to.