From Luce Gilmore, Cambridge, UK
Linda Geddes reports on the health benefits of fine-tuned lighting (8 July, p 6). Staring at a bright, white light is very soporific, in my experience.
When I switched from using a computer with light, chunky text on a black background to one with slender, dark characters on a bright background, I kept falling asleep. I wonder whether it is a coincidence that graphical applications usually have a dark background… Feeling sleepy, must sign off now.
