The answer is a yes. They will synergize. It's a very unpredictable combination in my experience. Pregabalin (Lyrica) by itself tends to get more unpredictable past 600mg Pregabalin in a single sitting. Combining with a potent, hypnotic Benzodiazepine like Norflurazepam (Victan) will likely lead to you unconscious/asleep. It's not going to kill you or anything, though blacking out is dangerous in its own right. It's one of those things that often leads to nothing, but occasionally leads to something terrible, so I don't recommend messing around with it intentionally.
I have actually used Benzodiazepines like Flunitrazepam (Rohypnol) and never found them to be good for anything but putting me right to sleep. I wasn't generally able to do anything worthwhile on them as the urge to sleep seemed to overpower everything. Your experience might be different. I would save the Benzodiazepines for a time when you need them. If you're enjoying the Pregabalin, it's likely to just muddy the water and make you tired.
