One area where my boys are total opposites - napping. Not so much in the taking of them (Matthew gave up on naps years ago), but more in the way they wake up from them. IF IF IF Matthew takes a nap, there's a good chance he's going to wake up cranky. It's not pretty. But Noah, he's a different story. When he gets in some good napping, this is how he wakes up.
Now, the other way that my boys differ is in sleeping through the night. Noah needs to put in some serious work on that.