is he over excited during day time? or either he is hungry? usually when my daughter (15 months) start rolled during midnight, I will immediately prepare the milk and feed her when she is not awake, and then she can sleep thru the night, hope this helps you. (if midnight wake up and cry my mum always say is too excited during day time, we try to don't make him too excited/scared during day time, and now is fine!)
Jesslynn Ong