Could it be restless leg???
If so, one of the things that is assoiciated with restless leg is fibromyagia.
Hello ! I have all kinds of thyroid diseases, you name it , I have it... Yes. when I am under stress, I wake up in the middle of the night shaking and with heart palpitation. When anxiety and stress are not present at my life, I don't get any weird symptoms like this.
I wish well for you and your husband
Melisa
Hi ! I don't have any possible answers, but there is a sleep specialist who frequently posts blogs about sleep problems, including sleep apnea. You may want to consider posting in one of his blogs and see if you get a response.
http://www.medhelp.org/doctor_profiles/show/645869
Good luck !