Firstly, thank-you Aussie and Californian Firemen: coming to rescue, as COVID-19 & Wildfires rack California; and to Gov. Newsom: for taking quick action and rallying support.
If you saw Bay Area's yellow skies of early September, and felt like you're already living on Musk's Mars ? Or on the set of Blade Runner 2021 ? Or maybe Apple was Beta-testing Night-Shift Sky, in iOS 15 ?
Feels weird ? Not your imagination... there is a biological reason: not enough Blue.
Light wavelengths are fundamental in driving our moods, ever since tiny creatures swam in algae-rich waters, and the only way to know if it was time to sleep, or wake-up go feed and avoid being eaten, was because only the blue-cyan waveband of sunlight is able to penetrate the watery depths, or be absent at night.
Those light-sensing cells remained, and are the ipRGC (intrinsically-photosensitive retina ganglia cells) located behind our evolved retinas, and they still drive our circadian rhythms & hormones.
If you live in the Bay Area you may already feel bad about a world in "Night-Shift", keep in mind we already know:
Blue at morning is important to stimulate, as is No-Blue at night.
