Matthew Walkers' (seriously flawed, I have to confess) book hammered home the point to me that almost any form of light at night can have a measurable impact on your ability to fall asleep and on your sleep cycle. I dim the lights at home 1-3 hours before I go to bed, if they're not dimmed already (which most are). I turn off lights up to an hour before I go to bed which triggers my brain to become sleepy. And minimal brightness just before bed of any screen I still interact with. We've also adopted the habit of never allowing our phone in the bedroom. Bed is the place to sleep, not another place to scroll on your phone. Another thing that helps me go to sleep, is to make sure I don't spend all day/evening distracted or focused on things. It helps me sleep faster when I allow my brain to meander and think a bunch of thoughts during the day, instead of putting on stuff to listen to or watch or do all day long.