Shaking the Head to Make the Sleeper Go Faster

Some time ago I had guys at my gym to sleeper me by shaking my head as they put on the rear choke. I was so confused and disoriented I couldn't do anything before it was too late. It had to be moderately fast to work. Ever since I kept thinking about it and looking for more guys to sleeper me out that way. Are there other ways to make the sleeper go faster? I'd like to hear what the experience of others has been,

Knife edge chops to the tops of the shoulders and sides of the neck to weaken the muscles before the sleeper seems to be effective on me.