I've been taking Ambien CR regularly for about two years. I started it just for sleep, but soon discovered that it is the only thing (drug or anything else) that helps my PN pain. Maybe it's not good for me, but I haven't been able to find any studies that show that. Hard to prove a negative. But I can believe that two years of staying awake in pain night after night would have taken a toll on me too. How can you really know what's the right thing to do when you don't have all the information?