I tend to rapid read novels for pleasure since I usually want to spend more time with the book anyway usually no superreading or dipping. I get more information out of the book by rapid reading after photoreading the book than I used to do by regular reading.

It might have been more fun to see if you could have had a dream in relation to the book by photoreading it just before going to bed.

Assess your reaction when you do rapid read the book. You might have had some distinct feelings in relation to the storyline. So check what you're feeling while you are reading the book. You could get a sense of recognition about part of the book may have triggered you physical reaction.

Alex