mashmetaller-
How much codeine do you have? It's hard to say what kind of effects you will get without having some idea of the dose you're going to take. Also, do you have experience/tolerance with opiates? I'm leaning towards a no, but you never know. Anyways, as far as sleeping goes, I really enjoy falling asleep on opiates. You're just in such a relaxed state, and if you're nodding (well, you'd have to be on some of the stronger opiates, but i do H pretty regularly so that's what i'm referring to), but like i was saying if you're nodding, sleep is pretty cool. It's not really sleep so much, but more of a in and out of conscousness (sp?) dream like state. Well, fairnymph said that they will dull the experience so I'm not sure how the codeine will affect you after rolling, but I'm sure someone will be able to help you with that one. Oh, and post the dosage you plan to take if you can it would help out.