HL non-nap update

So HL is still being very good, but one thing does have us a little concerned about giving up his naps. Since he was very young, he's exhibited the strange behavior of running back and forth while holding his breath and clenching/unclenching his hands. In the past week of no naps, this behavior has happened more frequently. While we don't know that it's indicative of anything wrong, it still concerns us to see it increase. Is he tired? Overstimulated? Manic? Something else? We're not sure. Yesterday I asked how he was feeling while doing this, and he answered "happy"- that was a relief, at least. We are considering having him take naps still, but shorten the time. Any suggestions? We'll keep you updated...