My son is 7yo nonverbal autistic. Often times he wakes up in the middle of the night (typically from 2:00am to 4:00am) screaming, kicking and banging the back of his head on the wall. The duration of his fits lasts from 1 to 4 hours. After all the screaming, kicking and headbanging, he eventually becomes exhausted and passes out. He is at the age where it is getting dangerous for us to try to protect him. When holding him during his fits, he swings his head back with so much force, he could break my chin or nose. Nothing we try works to calm him down. I am worried that he may one day crack his skull. What do we do?