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by maremmano 1337 days ago
I think this can provide you some information: https://en.wikipedia.org/wiki/Postprandial_somnolence

From the article: Counteraction A 2015 study, reported in the journal Ergonomics, showed that, for twenty healthy subjects, exposure to blue-enriched light during the post-lunch dip period significantly reduced the EEG alpha activity, and increased task performance.[29]