migraine
"I have used Flexeril for back pain but took one the other night because I had a migraine and couldn't sleep. I've never had relief from any migraine so I was amazed when after about 2 1/2 hours I got out of bed and felt OK to move around. After another hour or two I was feeling drowsy so ended up going to bed but I was happy to discover that Flexeril helped my migraine. It does make me VERY sleepy so I only take it when I don't have much to do the next day. I usually feel lethargic the day after."