I thought my ds had an ear infection or something when he started pulling
on both of his ears, but it turned out
that he was just doing something "new" when he was sleepy. I watched him for a couple of days after we had been to the doctor (who found no ear infection) and saw that he was doing it mainly when it was nearing time to take a nap or his bedtime. He did it occasionally other than that, but it got more intense and constant when he was REALLY getting tired.