My doctor prescribed me Lunesta for insomnia. I have been taking it off and on for a few months now. I notice that about a half an hour to an hour after I take it, I get good relief from my Fibromyalgia pain. I did a little bit of searching and found out that Lunesta works on the GABA receptors but no one is sure how. It's interesting that they have marketed a drug and they have little knowledge on how exactly it works. Does anyone here have any ideas on why Lunesta would work for FMS pain? Nevertheless, it's not a very good choice for a pain medication because a person can't function while on it. However, maybe they could come up with a less "drug you till your passed out" version for fibromyalgia.