18 month old tossing and turning all night

Brittany

My child has never been a great sleeper. He doesn’t sleep through the night. Usually wakes once or twice but lately he has been tossing and turning and waking up and refusing to go back to sleep. Last night we were up from 2:45am to 7am. Went to dr , checked him out to make sure he wasn’t sick. Only thing they could come up with is molars coming in. Anyone else dealing with this ?? I am feeling crazy with no sleep