Kristofires, do you have bi-polar or (real) attention-deficet hyperactivity disorder? Psychiatrist believe that those who suffer either of these two disorders (especially during the depression stage of bi-polar), opiates actually exert energy rather than depress in the way that it would someone else. It still is a downer, but people who have these disorders have been found to have a high abuse rate for opiates for it creates excitability and an energy effect.
I have both of these disorders and opiates have ALWAYS made me feel stimulated, yet still very relaxed. A feeling of "everything is alright". I actually work much better at the job and feel much more sociable on opiates, not energetic though like an amphetamine or caffeine. Just not nodding off or tired, I stay awake until the last minute of the euphoria