JoeJoe,
Have you had any sleep studies performed? I am a lifelong sufferer from insomnia ( as was my late mother, and my sister, neither of whom had IBD), but I find it comes and goes in unpredictable cycles. The sleep study I had done found that I had a very low % of REM sleep (4% as opposed to 20% which I think is normal), as well as mild sleep apnea. I was recommended to use a CPAP and tried it, but I couldn't sleep with it. Anyway, a sleep study would quantify your amount of REM sleep and whether you have any sleep apnea that needs to be treated.
I did have sleep issues that predated colectomy, however they may have also been related to the large dosages of prednisone I was consuming until I had colectomy. But like I said, there is no rhyme or reason to the quality of my sleep. I tend to sleep better when I have had busy, physically exhausting days. I think exercise and activity helps.