I HATE flexiril but I take Tizanadine for sleep, which is also a muscle relaxer and coupled with a half of a xanax (because I have massive anxiety at night) it works.
I was prescribed Xanax 3 a day to take one at night. My PDoc knew I was taking one at night, and knew I was mixing it with Tizanadine and all of the other meds im on.
I will say, though, that before I got on Seriquel XR, I had to take the entire day's dose (2) at the same time and at one point I was up to 3. But I had enough as some nights I didnt need any.
I like it for night as my legs twitch and back spasms so it helps that and makes me tired at the same time.
Today, because of the Seriquel XR I take a half of a 4mg Tizanadine and a half of a Xanax.
I have never been able to take a muscle relaxer in the day time as it makes me tired ao I say if it works, go for it.