K.D.
Has he learned to do anything new lately? Like sit up for instance? He really could just be too excited to sleep because he wants to practice his new skill. Or...in my son I notice this..when he doesn't get a good nap in during the day then he will wake up during the night. They just won't sleep well when they are overtired. But in your case, your baby at his age should be having more than one nap a day..