My DS6 has had night terrors for a few years now. It seemed to peak last winter around his 6th birthday. It is so strange to see your child in the middle of a night terror. His first time was when we had a teenage babysitter (my niece) here and DH and I were out to dinner. She called us very panicked. DS will cry and scream and his heart beat gets really fast his little body is just shaking. He is breathing so fast. He talks to us, but it makes no sense. He will point at the wall? There is never anything there.

Sometimes he is trying to fight the wall, walking around like he is confused. His eyes are open, but he doesn't see you. It really can be scary. We have learned some ways to help prevent some, but not all night terrors.
1. No TV after dinner. Not even the news or having a TV on in another room.
2. Keep stimulation to a minimum in the evening. Make bedtime soothing.
3. If he wakes up with a night terror, don't try to wake him up. It seems to make him worse. We just hold him, and try to tell him to go back to sleep. Keep him from hurting himself.
4. His night terrors usually start within 1 hour of bedtime. If he can get into a deep sleep by then, then we are usually okay for the night. If he has 1 night terror, he usually wakes up 1/2 an hour later and has another.
FYI, He had them every night while we were at disney last November. Lots of stimulation=lots of night terrors. Also we went to a Detroit Pistons basketball game in January. That was a bad night.
It is harder on the parents, than the kids I think. My DS doesn't even remember them in the morning.