Yet for centuries people have taken siestas in the blueish noon Sunlight, 5500 to 9000 Kelvin. Why the sudden claimed sensitivity to blue light at night? Corr

Yet for centuries people have taken siestas in the blueish noon Sunlight, 5500 to 9000 Kelvin. Why the sudden claimed sensitivity to blue light at night? Correlated to the ubiquity of indoors electrical lighting mimicking the colour of candlelight perhaps? Or perhaps Westerners aren't going to bed physically tired after a day of sedentary work?