muscle spasm
"Baclofen gave me terrible dream/nightmares and I would "walk in my sleep" during them,  that is, getting out of my bed and literally trashing my bedroom, knocking everything off the nightstand, flipping over my computer chair, tried to crawl under a TV tray... crazy stuff, that I NEVER did before.  As soon as I quit the baclofen (thinking that must be it),  those dreams never happened again.  PS, since baclofen did this to me, they tried Rx Tizanidine/zanaflex, and I had the SAME reaction from those so I just don't have a muscle relaxer anymore."