No it is not safe, the combination depresses the respiratory system, you can fall asleep and the brain stops telling the lungs to breathe. I have personal experience with this, my son died of the combination. There are 200 deaths a year in our region from this exact thing, so better be careful.
This is a lethal combination, it depresses the respiratory system and you basically fall asleep and stop breathing. A side affect of the opiate is the struggle to sleep, so you go after the benzo to help with the problem. People think they are using it in a controlled fashion, but it does not take much to push it over the edge. I have had personal experience with this, my son died a year ago from this combination. He was severely hurt in a MVA and taking hydro morph and morphine, he could not sleep so was given zopliclkne and oxaxapam, he went to bed and went to sleep, he died at 11pm. Doctors are pharmacists do not sufficiently warn patients of the dangers, be careful!