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Act like a sleepy, happy baby, talking little and smiling sleepily. Lurch into wide-eyed happiness right after "taking" the drug, then fade into sleepiness. Let your words and actions drift off into nothing. Drift off regularly, either by falling asleep or simply zoning out into oblivion. Scratch at yourself regularly, as itchiness is often a side-effect of opiates.
This is most common dangerous and powerful drugs like heroin. Downers, like opiates, usually leave people in a happy stupor, unable and unwilling to move off the couch they're on. They often squirm around sensually like a baby in blankets, getting comfortable and enjoying every single second of it. Watch Ewan McGregor's masterful performance as a heroin addict in Trainspotting to see how quick this shift can be. Opiates often hit hard, bringing a wave of euphoria, before putting the user into a mellow, sleepy, and often useless state. Most opiate users have their heads blissfully in the clouds. They may start a thought, but finishing it isn't really important. Ask someone's attention, but don't have anything to say when they turn to you. Keep your voice low and quiet. The overall idea is to remain stuck in the clouds, unable to pin down your thoughts. More often than not, this leads to literally falling asleep, your head lolling up in surprise slightly every so often, as if just waking up. Again, this is particularly true of heroin, but drugs like Oxycontin are actually the same type of compound, just slightly weaker. Scratch on your forearms, but don't make a big deal of it. This is just another uncontrollable tic, not some dedicated urge.