Do you feel that you are actually experiencing a "complete turning off" of consciousness during Zazen? What do you mean by "consciousness turns on" when you are coming out of Zazen? Can you describe the sensation (or lack thereof) a bit more? Do you actually experience this in your Practice, or are you speaking from what you believe you should be experiencing as "Nirvana" based on, for example, descriptions you have read? Before I discuss this point more with you, I want to clarify what you mean.