Can't help on kids night terrors..only the grown up ones! My DH has them BADLY - like the ones on docos where they film the sleepwalkers/night terrors. He was about about 10 times last night!!
Best thing for him is to reassure him (even if not fully awake) that he's fine and I always tell him where he is, as that seems to be a trigger (e.g. - "You're OK, we're at home, in bed" or "It's OK, we're at that Hotel in Nelson" etc).
I feel for you! Good luck!