No screens was integral for me, as well as changing the type of lighting I use. I generally try to shut down my screens when f.lux starts up on my computer, as I know it's better for my brain to start getting tired them. I'll also use a redder light instead of a right LED one, which I've found helps too.
Since then I have been: - Trying to exercise every day - No screens after 10:30.
Seems to be making a big difference for me.