Dear Welcome to HCM We understand your concerns I went through your details. Anxiety disorders are a category of mental disorders characterized by feelings of anxiety and fear, where anxiety is a worry about future events and fear is a reaction to current events. These feelings may cause physical symptoms, such as a racing heart and shakiness. In case of panic disorder, there could be more physical symptoms like breathlessness, intense head ache etc. A nocturnal panic attack is a panic attack which occurs in the midst of your sleep, waking you up for no apparent reason. studies suggest that between 50%-70% of people with Panic Disorder will experience at least one panic attack at night. That means, in your case, nocturnal panic attack has its base on your anxiety disorder. If you experience nocturnal panic attack again, Let go of sleep, and trying to return to sleep, for a little while. Work with the nocturnal panic attack, instead of against it. Don t fear anxiety or panic attacks, for they come again and again and disturb you. Please get expert treatment for anxiety disorder. Consult a psychologist. 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.