Also, you may be expecting to feel the urge to dip to be something you understand. It generally is not.
Let me ask you this: Did you notice anything different as you were paging along? Anything at all? I know that for myself, anytime i get to feeling tired, it's my signal to stop and dip.
I mean---did you notice when you nose twitched? or your foot itch? or your gut move? No? Of course not. Who would?
But, that's how it works.
So, state clearly what you are looking for and then watch your body signals more than the pages. If you are watching the pages, then you are using your conscious mind which is incapable of telling you when to dip. Is the conscious mind superman? No.
good luck & find your penguin 
[This message has been edited by Margaret (edited May 08, 2002).]