G.L.
have you washed the blankets, maybe there's an insect that is biting him....
do you leave some light on in the room?
change his mattress,,,,
he should have all his teeth by now right?? Sorry it's been a while for me I forgot at what age all their teeth come out..
change the room around,,,is it decorate w/things he likes? something in the room he's not liking and frightens him at night, how long has he been sleeping in this room alone?