The effects of prior light history on the suppression of melatonin by light in humans

When u expose yourself to daily low light intensity, like the kind of dim lighting in most indoor environments, it significantly INCREASES MELATONIN SUPPRESSION at night if u are exposed to night time artificial lighting. The test group who got outside and was exposed to bright sunlight many times during the day did not have nearly as much melatonin suppression at night.

Blue-Enriched Morning Light as a Countermeasure to Light at the Wrong Time: Effects on Cognition, Sleepiness, Sleep, and Circadian Phase

In addition to making you more alert during the day, improving your mood and sleep, the blue in bright morning sunlight acts as a countermeasure or antidote to some of the damaging health effects of artificial light at night.

It doesn’t give you a free pass to use artificial light at night without bad health effects, but it reinforces your circadian system so that exposure to a blast of artificial light at night doesn’t hurt you as much.

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