narcolepsy
"I had about 3-years without a full night sleep. Once I started Xyrem, my sense of being tired was gone. I was also taking Provigil. Xyrem was used for the Cataplexy issue and the restless leg syndrome. The downside to Xyrem is that it caused Sleep Apnea, of which did not make my wife happy and after 2-months of using the mask and machine, it was not worth being on Xyrem. Also, it had interactions with other medications."