Can't blame this on the full moon

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I have had a similar problem, but easily got over it. All 8 of my Gran Mal seizures probably have been triggered by a form of sleep apnea. I was asleep on my back for all of them. Mine is different than the regular kind. Laying down on my back closes off something in the rear of my sinuses... just above the roof of my mouth. It was confirmed by my Ear Nose and Throat doctor last week. All types of sleep apnea can be corrected with surgery called somnoplasty as far as I know.
However, I did have a small sinus polyp two months ago. I used nasonex for two months, twice a day. Nasonex is a sinus steroid that shrinks nasal tissue. I still use it once a day.
The polyp is now gone, and I breathe better on my back. Haven't tried sleeping that way yet. I got used to sleeping on my sides or stomach since 2005.
Have you had any sinus/allergy trouble when you have the seizures while sleeping on your back?
Can you lay down on your back (awake) and breathe OK?
If you find out it's something else, let us know.