This doesn't mention anything about the light promoting wakefulness, but rather simply assesses levels of comprehension: "These dependent measures included subj

This doesn't mention anything about the light promoting wakefulness, but rather simply assesses levels of comprehension: "These dependent measures included subjective (visual) fatigue, a letter search task, reading speed, oculomotor behaviour and the pupillary light reflex." Staring at a light producing screen all day then not staring at one could still be a good move.