Period with no difference in light levels (‘baseline’)
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A two-factorial r-ANOVA revealed neither a significant interaction between the factors ‘light intervention’ and ‘test cycle’ nor main effects of either factor on the aPVT reaction speed (interaction: The number of lapses in aPVT also did not differ between the two light interventions across the five test cycles (stronger light pulse condition: Moreover, we observed a significant main daytime effect for RMSSD, 