Tizanidine
muscle spasm
"I have chronic pelvic pain of unknown origin.  This medication reliably relaxes me and knocks me out enough to sleep. It also sedates me enough to have conversations I don't recall and to pass out mid-sentence. Needless to add, perhaps, I do not take it during the daytime. Like many users, it tends to wear off after about 4 hours and I find an additional dose doesn't promote longer sleep. The sleep I do get is so good that I can put up with the short duration. I am taking the 4mg tablet. A time release formulation would be ideal, I think."