insomnia
"I started mirtazapine a little over a month ago.  I played with the dose at anywhere from 7.5 to 15 mg and settled on 3/4 of the 15 mg or about 11 mg as my sweet spot for getting anywhere from 7 to 8.5 hours a sleep a night.  I have not gained weight on it and have had no side effects except for feeling a little groggy the first half hour after waking.  I was able to successfully taper off Lunesta, which I had been taking for about six months after a bout with severe insomnia,  with the Mirtazapine, and I prefer the more natural Mirtazapine sleep over the Lunesta.  It also works every night without fail.  Great drug for insomnia!"