Wow. Sounds like a kid who knows what he wants. Tired (although not necessarily overtired) and knows that he's got to go to sleep on his own cause that's what mommy taught him, and he just wants to go to sleep and to heck with all of the rest of fooling around. Try just a quick cuddle standing next to the crib and then lay him down. Some people just don't want to be messed with when they're tired. :roll:
And yes, everything changes when they get older.