Great resource with some nice tips and since its super hard for many people to not use electronics in the evening I could suggest an alternative - what I do is descreening - take a 40-60 minutes time off any kind of screens before bedtime.The best thing to do for me personally is preparing stuff for the next day and then half an hour of reading a book (kindle is okay too from what I've researched).Practicing a foreign language with pen and paper or some kind of presentation you need to do or working on something to learn(without a computer or tablet) could be very useful too since studying before bedtime gives a significantly better retention rate.
Obviously a small con is that you need to be using artificial light for these kinds of activities , but it still better and you cant have it all ! :)
Cheers,
Danny.