Have you had the chance to raise this with your MH team?
I think it is important they are aware.
I don't know much about nocturnal panic attacks, they seem to be more common than people tend to think though. I looked up a few links and these two looked reasonably useful to me:
http://www.anxietycoach.com/nocturna...c-attacks.html
http://www.calmclinic.com/panic/attacks/while-sleeping