Spoke to my friend the day before yesterday, we caught up over lunch, so I asked her about drugs like: Heroine, Cocaine, Morphine, Meth and Ice. All of them she has done except maybe Ice.
She is also Paranoid Schitzo, so these drugs use to set her off big time and she did become very dangerous, which is why we never talk about it a lot and I didn't think she experienced the "nodding" thing. (In and out of conscious levels like on the verge of sleeping or waking up).
I have always been curious what it is like though, but would never do it, I don't even smoke or drink.
She did tell me that Heroine (maybe Cocaine) does it, as well as strong doses of methodone, whether abusing it or under supervision.
Anyways, these days she is completely drug free, was a very hard journey but no looking back for her.
NOW I do know what it is like to be on opiates or a substance without really being on it.