Now I Lay Me Down to Sleep?

I am glad that my son feels comfortable in his crib, that he's happy there...but lately he thinks that naptime = playtime. Put him in his crib and he starts all kinds of acrobatics--at least one arm or leg will be sticking through the bars and one or all of his stuffed animals are pulled down--those may need to find a new home!! Eventually he will fall asleep, but not until he and Pooh Bear have talked through all of the world's problems and have proclaimed in their own little way..."oh, Bother!"