battling sleep

I'm not sure what changed, but Gordy doesn't scream and cry anymore when we put him in bed.  Usually, as long as he's tired, we give kisses, say goodnight, and then leave him in his crib where he rolls around for a few minutes and then falls asleep.  But, if he's not tired enough, he'll spend a little bit of time throwing everything out of his crib, he'll stand on his tip toes to try to pull down his mobile and then pace around a few times before laying down and giving up.  The other day, however, he seemed to be particularly against going to sleep.  So, after we left him in his room for his nap, we watched him throw everything out of his crib, pace around, and then prop himself up against the back of his crib in a seated position.  Over the next few minutes, he did his best to sit upright while sleep slowly took him down... it was one of the funniest things either of us has ever seen.