Imo, you're just throwing a big ass variable into the process of ctb with SN by doing this. Even if you'd tried an OD with anti-psychs before and knew exactly how they affected you, there's no data on this in combination with SN (that I know of...always possible its out there.) Time to unconsciousness with SN alone is ~20 min, and I've seen a report where it happened at 8 min. The risk is way greater than the potential reward, in my opinion only, of course.