I'm surprised the article mentions the blue light problem and devices but does not talk about flux, it's a little app that shifts the color temperature of your display to match what you're supposed to see at your location given the time of day. So, after sunset your screen basically turns orange. Although it's a bit annoying and takes some getting used to, I've tried it on and off and whenever I'm using it I fall asleep and stay asleep much better than without.

A big problem for me with iPhones compared to android is that something like flux cannot work on them, so I have to avoid my device late in the evening to not disrupt my sleep.