Do refular light bulbs have mercury in them? Those are the only ones we have in my house, as far as I am aware. I was concerned that my computer is directly below my light bulb (about a metre between my head right now and the bulb, but I have an uplifting light shade, which may help somewhat , I don't know. I've heard that any artificial light isn't good. I'm trying to get up earlier and bed earlier to make the most of natural light.