I'm pretty much the same as you, Stomper - I really dislike it when I can't see the things around me , but I'm also ok when hubby is around.
I have always disliked dark - I don't consider it 'fear', it's more of a strong feeling of discomfort. I always had sharp eyes, and always had the need to be able to observe everything around me, every time. if I can't see what's around, it really makes me feel uneasy, still up to this day. I never felt safe when I had to be in a dark place, and it made things especially difficult because I always was a bad sleeper and woke up during the night frequently, and in such situations it felt really bad that I couldn't see where I am and what is around. as a child I always slept with some lights on - as an adult I normally don't do this anymore - I have learned to simply not have heavy curtains instead
we live close to the city centre, so the city lights provide enough light in the room during the night. thankfully, my husband really doesn't care whether it's dark or not, if he is sleepy, he will sleep either way, so he is not annoyed by my "bright sleeping habits"