Too Big For Naps?

Ben and Lauren are in the horrible transition between needing a nap and not needing one. Poor Benny is like his mommy; he needs his sleep. But, he wants to be big like his sister and not take a nap. Most days he ends up falling asleep on the couch between 4:30 and 5:00. He gets to the point where he is crying and doesn't know why or how to stop; when he finally stops it is because he has fallen asleep. I wish I could help him understand that he could avoid this out of control feeling by simply taking a nap. Today he didn't make it to the couch before he fell asleep.