restless and not sleeping through night

Jacob has been having trouble staying asleep throughout the night and is very restless. He takes melatonin (3mg) to help him fall asleep, which has been very helpful (asleep in 20 min. or less) but after sleeping well for half of the night, he will wake up around 3 or 4. He starts to talk to himself, becomes restless, and never really goes back to sleep again. This morning, he was doing the same thing and talking to himself. I thought he was dreaming or was still half asleep, but when I asked him questions he would answer me. He kept repeating what he was saying but seemed wide awake and would respond. He also kept fidgeting with him hands and clapping. He is on Neurontin and Depakote right now. Has anyone else had something like this happen with their kids? I want to call our neurologist, but every time we have discussed his sleeping problems with him, he just wants to add another medicine. Jacob also acts out everthing he watches on tv and movies that he likes. He will do this in the middle of the night also when he wakes up. Is this normal? Since he is not sleeping well, he has had two seizures during the day. He normally only has them while he is sleeping since starting Neurontin. With school starting next week, I'm freaking out that he will continue to have problems sleeping and have seizures while he is at school. I hope someone can help me with my questions, I'm really worried.