I’ve combined alcohol with a few different kinds of sleeping pills and i have to say i didn’t really enjoy the feeling it gave. Basically it just destroys your coordination, attention span, and ability to stay lucid, which doesn’t equate to a good time for me. Mixing alcohol with painkillers makes them less euphoric, the high from opiates is much better on its own.
If you are doing this OP please find something else to get high off, mixing most drugs with alcohol is extremely bad for you in the short and long term. Go smoke some strong herb and if you aren’t satisfied with that then mix a drug with cannabis instead of alcohol, at least weed won’t kill your liver.