Sam,
We are all different and are all coming from different places and diseases. Not everyone has UC or Crohns...some have the whole gamut of autoimmune disease and others none. Some are coming from colon or other cancers and still others are pouchers or baggers for a dozen other reasons (yup...Accidents, physical deformities...). We did not all fall sick at the same age either so some of us came to this disease with excellent health while others deteriorated slowly but surely.
All of that and 100 other factors will go into your energy and immunity level. Like Scott said, in his case, it was sleep apnea that was the culprit (my hubby too and he doesn't have any underlying disease)...I find that as long as I am under high stress and tension I have energy to burn (plus all of my supplements) but once the stress level is down, I cannot get enough sleep...you put me anywhere and I slowly slip into sluggish sleep...Age? Nutrition? Sugar? Who knows but the important thing is to find what works for you and keep it up.
Sharon