It's important to remember that late night LED screen usage (and overall usage of high-contrast displays like in tablets and phones) prevents generation of melatonin which promotes sleepiness.
It's great that iOS/macOS now have night shift (and I've been loving F.lux for years), but it would be intersting to see how sleep patterns have been impacted by overall tech adoption.
It's great that iOS/macOS now have night shift (and I've been loving F.lux for years), but it would be intersting to see how sleep patterns have been impacted by overall tech adoption.