Hey M.! My 16 month old is doing the same thing, it's driving us all nuts. I really do think it is molars- that's what everyone tells me, and I noticed my daughter holding the side of her face or chewing her fingers a lot lately. Molars create a dull, aching pain that is hard to ignore- I have found that infant motrin (NOT tylenol) makes a big difference. My daughter also seems to have discovered that it's WAY more fun to play than to sleep, so rather than ty and sleep through the teething, she's just refusing. it's hard, but give the motrin a try and maybe put something in the crib that he can chew on if he needs it.