Dear
Welcome to HCM
We understand your concerns
I went through your details. First of all I wish to know why are you Asking "Could the sudden wake up from sleep be a sign of PTSD?" without any other additional symptoms in itself proves the problem is not PTSD. PTSD comes after a traumatic experience or event. It could mild, moderate or severe. Just startling is not a significant symptom in the case of PTSD. The significant symptoms include Feelings of intense distress when reminded of the trauma, Intense physical reactions to reminders of the event (e.g. pounding heart, rapid breathing,
nausea, muscle tension, sweating), Avoiding activities, places, thoughts, or feelings that remind you of the trauma, Increased
anxiety and emotional arousal etc. Does your husband experienced any traumatic events in the past?
If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible.
Hope this answers your query. Available for further clarifications.
Good luck. Take care.