Katie, here is what we learned from our sons: the more tired they got, the harder it was for them to settle themselves to sleep--so MORE sleep actually helped them sleep better and prevented the wildness. Neither of my sons nap any more (they are six and nearly four) and there are a lot of nights where they are in bed, with teeth brushed and stories read and lights out, at 7:00 pm. Tonight, in fact, was one of those nights, and both boys were sound asleep at 7:15. You don't say if your son still naps, or how many hours he sleeps at night, but when my sons were two they were each napping for two or three hours in the afternoon, and going to bed fairly early (8:00 or so). And yes, it made it hard to go and do anything really big and elaborate during the afternoon, but the nap made all the difference come dinnertime.