Yesterday, I taped aluminum foil over my bedroom window and not a shred of light comes through. It's like a cave in my bedroom, completely dark. Can't even see my hand in front of my face even at 1 inch away. Even after 2 nights at 9.5 plus hours of sleep, I have lost my craving for carbs which I have been struggling with since February. I'm really excited about it and plan to continue doing this for at least 2 months as an experiment.