I guess it could be, but he woke himself up coughing and his nose has been running like a faucet for two days. He was around a sick baby this week, so he probably caught her cold. But I'll keep an eye out for teeth!
Today he asked to be put down for his nap! He went and got his milk cup, wanted to be picked up, then snuggled his head onto my husband's shoulder like he does at sleep time. He put him in bed and he went right to sleep. Yay! Only slept for an hour again, though, because of the cold.