Amy,
I am so sorry, but your post made me laugh out loud. Not for what you wrote, but because I have this same problem with my almost 10 month old. Two days ago we were headed home from grocery shopping - a ten minute drive and HARDLY what I'd call long enough to constitute a good length of naptime. So of course, sixty seconds into the trip home, I look back to see his big brown eyes getting heavy lidded. What do I do? I panic; "HEY SAM! WHADDYA KNOW! IT'S A TREE! HI TREE! WOWEE JUST LOOK AT THOSE CLOUDS!! HI CLOUDS!! WHOOOOWEE! THOSE ARE HIGH UP IN THE SKY!! I WONDER IF IT'S GONNA RAIN??? HEY A CAT!! STAY OVER THERE, CAT!! MEEOWWW!!" and so on and so forth.
So no. I am sorry. I have no advice. I got nothin'. Just sympathy. And if you see me driving down the street, try not to point and laugh at me, cause now you know that I'm not a crazy woman.
Good luck!
J.