It’s hard to tell when I started using this but it seems like forever and I can’t (or won’t :-P) look at any screen anymore at night without color temperature correction. These days wether you’re working on a nice Apple iMac or a Microsoft Surface this is now a native function. But I am forever grateful for the people from f.lux who pioneered this thing.

Here are a couple of ways to enable it on your specific devices (youtube tutorials from various sources)

https://www.howtogeek.com/199303/reduce-eye-strain-and-get-better-sleep-by-using-f.lux-on-your-computer/

Screen protectors, Hue lighting?