For those who do not live alone - When you wake up, do you turn on the lights or just walk around in the dark?

I rarely turn on a light when I wake up in the night, I know my way around and there is nothing to worry about tripping over. The only time I have turned on a light was when I'd have to get dressed for work (and only long enough to do so), otherwise I only turn on lights if I go to other parts of the house so as not to wake/disturb my wife.