Quetiapine
"Had insomnia for years, due to anxiety and mild panic attacks, also complicated by dystonic tremor in my neck, head constantly twitches, even when lying down.  On a good night was getting 5 or 6 hours broken sleep.  Tried several meds, nothing helped.  Doctor suggested quetiapine, I was a bit reluctant as its such a strong drug but desperate enough to give a try. I'm finally sleeping through every night!  Very constipated when I first started but came right after a few weeks.  Also wake up feeling groggy but am fine once I'm up.   No problems with weight gain.  Using 25mg but thinking about cutting down to 12.5mg.  Love being able to sleep!"