Here's more about f.lux from Book of Joe:
In yesterday's Washington Post Health section Greg Linch's reported on how the light from a computer or iPad screen may potentially disrupt the brain's melatonin production and cause insomnia.
He then described an interesting desktop application called f.lux, which "adjusts a computer screen's color throughout the day. During daylight hours, the screen's undertone is the familiar blue. As sundown approaches, it begins transitioning to a warm shade of red-orange. In the morning, it's cool blue again."
"The software application, which launched in February 2009, works with Windows, Mac and Linux.