well, before we went up to the cabin he was only waking once, usually when the motrin wore off. Once we went to the cabin, he started to wake twice while we were there. The day we came home he did a 40 min nap there and then a 1.75 hr nap I woke him from...and then slept GREAT that night. But, don't know if it was from the lack of sleep while we were away. So, in a short answer....he's waking up either way but I just figured teething because after a dose of meds he goes right back to sleep.