This is old news. Many fibro patients do have alpha intrusions, which cause non-refreshing sleep and an increase in pain.
Xyrem is the brand name of sodium oxybate, a sleep med that works on Gaba-B. It's a short-acting, powerful, CNS depressant that puts the patient into deep-stage sleep. It's regarded as very safe when used as directed, partly because it is so short acting, which requires the patient to get up in the middle of the night and take a 2nd dose. Also, it's regarded as safe because it leaves Gaba-A alone, working on just Gaba-B.
Jazz Pharmaceuticals, which still owns Xyrem, I think, petitioned the FDA to approve Xyrem for fibro patients and did a lot of clinical trials, with very good results. The FDA turned down approval for fibro. I think this was 4 or 5 years ago.
Xyrem is currently approved only for narcolepsy and cataplexy in the U.S. My sleep doctor has worked with Xyrem for a long time and participated in the fibro trials. He was appalled the FDA rejected Xyrem for fibro use.
He thinks the rejection wasn't based on results, but how it would be a big pain to have this powerful, exceedingly expensive drug approved for the legion of fibro sufferers. Jazz has the patent on pharmaceutical GHB until 2020, I think, and they charge an exorbitant amount for it.