Non-visual effects of light on melatonin, alertness and cognitive performance: can blue-enriched light keep us alert?

Furthermore, salivary melatonin correlated negatively and significantly with the GO/NOGO reaction times for light exposure at 6500K [ R = −0.46; p = 0.04], while although the correlation was negative, it did not reach statistical significance for light exposure at 3000K, and was a tendency for light at 2500K [respectively, R = −0.27; p = 0.16; R = −0.22; p = 0.07].

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