I think most people have had that scary paralyzed feeling that wakes them up occasionally, independent of being bothered with sleep apnea. As far as the jerking thing, I'm wondering if you supplement with magnesium (preferrably chelated magnesium gylcinate or another quality form). Most people (Americans especially) are very deficient in it, and it's very important to me as I'm a 5-day a week gym guy. Muscle twitching, especially at night, is a symptom that you may be low on magnesium. Taking it at night helps my sleep, and it is also very clear that I sleep best on nights after a workout that day.