This is interesting. From Science Alert: "We Emit a Visible Light That Vanishes When We Die, Surprising Study Says." From the lede:
Life truly is radiant, according to an experiment conducted by researchers from the University of Calgary and the National Research Council of Canada.
An extraordinary experiment on mice and leaves from two different plant species has uncovered direct physical evidence of an eerie 'biophoton' phenomenon ceasing on death, suggesting all living things – including humans – could literally glow with health, until we don't.
Also:
The science behind biophotons is a controversial idea in itself. A variety of biological processes clearly generate bright displays of light in the form of chemiluminescence. And for decades, the spontaneous sputtering of light waves anywhere from 200 to 1,000 nanometers in length has been recorded from less obvious reactions among a wide diversity of living cells, from cow heart tissue to bacterial colonies.
A strong contender for the source of this radiation is the effect of various reactive oxygen species that living cells produce when troubled by stresses such as heat, poisons, pathogens, or lack of nutrients.
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