Nope, they both have Athletic and Brave. Am focusing on them being either in law enforcement or the martial arts LTW. I wonder if it is the fact that they are babies; maybe the programing is set up for some sims under a certain age to have the fear of the dark?
The father is in law enforcement and one of his traits is brave, mom (my sim) is an author. They are my twin babies. They just aged up and I have given them the Disciplined trait.
I have the family on hold right now, I am looking for a bigger house for them.
The other baby in my other family traits are Love of Outdoors and Artistic.
As for the lights, they go off when everyone goes to bed, or at least in my sims homes they seem to. They come back on when a sim comes into the room. It is like evening, when the sun is going down, twilight.
What made me think of it is my sim family in SV, with Conner and Sasha, I was putting the crib, potty chair and other baby stuff in the "attic" and realized that one of the babies/toddlers had been beside the chimmey, and she didn't seem to mind the darkess. The boy was beside the window, so he had plenty of light. For a while she had her days and night mixed up and spent a good part of the night singing and playing in her crib while everyone slept.