I just spent a bit over an hour meditating on nam in a dark room and it was the most intense mediation (or deepest) I've ever gotten in the years I've been meditating. It was wicked awesome. I usually just see blackness with my eyes closed, but today, I started feeling something coming over my eyes and then everything just turned pure white. I wonder if the whiteness was me going into a deeper level or if its something physiological?