It seems as though we have differing opiate/opioid experiences, but that's to be expected.
I personally found hydromorphone to be exceptionally sedating. Every time I've taken it, I've ended up nodding pretty hardcore, more so than any other narcotic I've ingested. By contast, oxycodone was quite stimulating and very motivating. In fact, I personally find that oxycodone can sometimes be more motivating than Dexedrine.
Codeine never really sedated me much at all. That might have to do with the fact that I'm allergic to it and end up getting a histamine reaction whenever I take it.
To repeat, I found hydrocodone to be very neutral. It didn't motivate me, but at the same time, it didn't cause me to nod. Granted, the first time I took it, I noticed that it had a very relaxing quality.