Thanks Howard. The claimed mechanism affecting chance of stroke to quote is: “Continuous exposure to artificial light at night can suppress production of melatonin, a hormone that promotes sleep. People with poor sleep, compared to good sleepers, are more likely to experience worse cardiovascular health over time”.
Am not sure the researchers have been able to prove a causative link. Their argument is a multi-step one with some doubt that one can link each of the steps directly. People who are exposed to a lot more light at night are leading a very different lifestyle to someone who lives the saying, “Early to bed, early to rise makes you healthy, wealthy…”
Richard