Intermittent exposure to bright light during the day counteracts sleepiness and may improve attention span, according to data presented by a Japanese research team at Sleep 2009, the annual meeting of the Associated Professional Sleep Societies.
Under the two light conditions, sleepiness was determined every two hours using the Multiple Sleep Latency Test and by subjective reports from the study participants. Attention was determined by performance testing and by measuring P300, "an auditory event-related potential that reflects cognitive function", the researchers explain in their meeting abstract.
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