"We should live in darkness at night, but since early human evolution one of the properties humans wanted to change was the darkness. So we need to ask what type of illumination is less harmful."
White LED light (which is actually blue light on the spectrum) is emitted at short wavelengths of between 440-500 nanometers. The study showed that this type of light suppresses the body's production of Melatonin five times more than the orange-yellow light given off by traditional high-pressure sodium (HPS) bulbs. Metal halide bulbs, often used for stadium lighting, suppress Melatonin at a rate more than three times greater than the HPS bulb.http://www.enn.com/health/article/43820
f.lux... it makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.It's even possible that you're staying up too late because of your computer. You could use f.lux because it makes you sleep better, or you could just use it just because it makes your computer look better.