It turns out there are research results that show that the temperature
of the light cat affect your Circadian rhythms.
(The original paper is here:
http://www.deborahburnett.com/images/uploads/EffectsofLightsofDifferentColorTemperatureontheNocturnalChanges.pdf
but for most people the summary on this Wikipedia page would be sufficient: http://en.wikipedia.org/wiki/F.lux#Hypothesis

This Wikipedia page is actually describing the software that changes
the color calibration of the computer to adjust the color temperature according to the time of the day to improve sleeping.
The software is called f.lux, and there are other similar packages, e.g.
Redshift:
http://en.wikipedia.org/wiki/Redshift_%28software%29

It's an interesting idea but I suspect it would largely mess up the screen calibration for photography-related purposes.

Cheers,

Igor


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