This is the worst! The same thing happens to me whenever I'm sick, especially right in the middle of the day (when you try to get some rest). The last time I was sick I kept having this recurring dream, when I would wake I'd be all flustered, breathing deeply + trembling =(
Most of it had no bearing on real life but, a little bit did which made it worse. The mind is such a complex thing but, it's also really intereting just learning about ourselves.