Do you sleep with the light off (or on), or with a night light?

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I know a lot of people are afraid of the dark, so they might sleep with their light on or with a night light. Other people might sleep with the light off. For example, my brother sleeps with the light off, because he's not afraid of the dark. I personally sleep with the light on because I'm afraid of the dark, and I can somehow sleep with it on. My friend sleeps with a night light, as in, she needs one or she can't sleep. How does a night light help you sleep, and how can you get so accustomed to it that you can't sleep without one? Or is it just knowing that it's there? Anyway, just wondering...