Vimpat With Onfi Started Last Yr. Used To Sleep Solid

Vimpat with onfi started last yr. Used to sleep solid thru night. Hhavent now in recent months. Can get to sleep but not stay asleep. Remeron was added. At one point onfi, pm dose was 20 mg but reduced to 10 mg bcuz couldnt function cognitively during day. Could my brain have become dependent on the onfi for sleeping? ( previous to this, my sleeping problem first developed by end of 2013 from being on klonopin for many months. I am 47 and before then, have never had sleep issue. After stopping klonopin its never returned to the hard sleeper i had been whole life. )