My rheumatologist prescribed Flexeril for my sleep problems. I was taking 2.5 mg at first...then increased to 5 mg which used to knock me out. For the past few days though...I've had a horrible bout of insomnia - even taking the Flexeril. Has this happened to anyone else? I don't know what to do...it used to help so well and now I feel awful...no sleep...and I'm very exhausted.