like ccfl bulbs , lamps, room lighting, ceiling lights.. u don't have room lighting ?
Most of those don't have a lot of blue light. Typically bulbs come in warm colors which are much less blue. It's the white light from fluorescents that are really the problem.
Even many warm lights have some blue. not tungsten, i mean those ccfl curly bulbs.
Overall, you want low intensity as much as possible for night time.
However dark it is outside, that's how it's suppose to be "nature"