Blue Blocking Glasses Can Prevent Circadian Disruption Without Changing the Time You Fall Asleep

Why sleep onset is such an insensitive measure of circadian health

For the first 10,000 generations of human existence, we never had to worry about exposure to blue light in the evenings. Wood fires and candles contained virtually no blue, and nights were dark. But in the last ten years, we have entered the era of ubiquitous blue-rich LEDs in our screens and lights. This is less of an issue during the day, especially i…