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Nocturnal Alertness Improves After Bright Light Flashes

Exposure to millisecond flashes of bright light improves alertness at night, according to research.

The results indicate that subjective sleepiness decreased and objective alertness improved after participants received a two-millisecond pulse of bright light once per minute for 60 minutes.

Eurekalert reports:

“According to the American Academy of Sleep Medicine, the solar light-dark cycle is the primary environmental time cue for synchronizing the circadian system to the 24-hour day. Artificial light absorbed by visual photoreceptors also can affect circadian timing by triggering the suppression of melatonin, a hormone that acts as a ‘darkness signal.’”

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