My 15 yr old son had a closed head injury and developed epilepsy. We have been thru several meds;
tegretol, depakote,carbitrol, and topamax, and finally
keppra. He too has nocturnal seizures arising from his frontal lobe. These meds come with terrible side effects, good luck finding the right one for your son. I know that on topamax my son had issues with memory and concentration, he couldn't even spell "if" when he was 12 ! I knew that something was wrong!