Well it might just be the general insomnia causing the night jolts, but from what I've read Xanax is quick acting in its rebound affects. I am hyper-sensitive to RX drugs. I did just speak to a nurse at my practice about it and she said, yeah, use sparingly and they can have nasty side effects.
But being the anxious person I am, I keep wondering if it isn't the Xanax, what is it! These night jolts are killing me, as is the insomnia and they seem to go hand in hand.