I jumped up and switched on the room lights. Then I switched them off again.
We went to get reinforcements. The Husband was forcibly brought in to stand vigil under the light just in case a misty figure DID begin to form in the room and point its finger at us to tell us... well... whatever it wanted to say. The Husband was intrigued.
Then, Little Boy slapped his thigh. "Mom! It's the rat light!!" Oh boy... what a relief. I had installed fluorescent lights above the ceiling boards and under the roof to scare away any rats that might decide to make a nest under the roof. Every now and again, we switch on the rat lights to flood all the under roof areas with white light. My friend L taught me this cheap pest control trick.
Well, when the rat lights are on whilst the bedroom lights are dark, the white light escapes through the tiny openings that bring electrical wires into the bedroom to power the bedroom lights. This light infuses our ceiling light fixtures with a ghostly blue glow. But they're only rat lights.