Well, I do not feel sleepy during the reading. But perhaps being more mentally active is a key to the process because it helps me to better pay attention to the book? I do not feel much different when I'm reading the book, it is only after I go to sleep and wake up that I realize that something was different. Usually it takes at least several days of long reading for me to notice a positive effect on my sleep, but with this position it's much quicker with much fewer pages being read. But it doesn't make me more quickly sleepy when I am reading the book.
