My little girl sleeps better with a night light as well. We transferred her to her cot a few weeks ago and it was a nightmare because I didn't think about lighting. When that was fixed she slept straight through. She still sometimes wake (in the evening before her deep sleep) but goes back to sleep if her music is still on.

When she was still sharing our room, we put on the light which was very unusual for us and it took us a few nights to adjust to the light but eventually it was o.k. I think as adults we must learn to adjust to fit with the kids more.. anyway that is my 2 cents worth of input