For some reason in the evenings I often don't turn on lights when entering a room just to quickly grab something or to simply walk through to another. It's a weird habit. It all started with the rounded staircase between ground and first floor. I only use the dim lighting coming in from the evening sky. Maybe I'm doing it to train myself certain safe tracks to take in case of a power outage? Either way, today I bumped into a chair with two toes. Not pleasant, but oddly enough my inner collision warning signals went off a split second before impact. Guess it's starting to work. Anyone else who does that, and for what reason?