So simple yet so right

It may not affect your sleep patterns, nor make you more productive, but it definitively helps straighten-up things a little. It’s an app, for Mac and PC, to adapt the colour temperature of your screen to the time of the day and the type of lighting around your desk. I like how, despite the intrinsic coolness of the idea, the authors felt like collecting research snippets on the detrimental effects of wrong lighting to make it even more convincing.

Seven healthy males were exposed to the light sources of different colour temperatures (3000 K, 5000 K and 6700 K) for 6.5 h before sleep. The horizontal illuminance level was kept at 1000 lux. Subjects slept on a bed in near darkness (<10 lux) after extinguishing the light, and polysomnograms recorded the sleep parameters. In the early phase of the sleep period, the amount of stage-4 sleep (S4-sleep) was significantly attenuated under the higher color temperature of 6700 K compared with the lower color temperature of 3000 K. Present findings suggest that light sources with higher color temperatures may affect sleep quality in a view that S4-sleep period is important for sleep quality.