Things that work for me:
-Teaspoon of Calm magnesium powder before bed. Not every day but a few on and off.
-no phones or tv in bed
-no blue light for at least 2 hours before bed
-dark dark room
-same bedtime each night
-no alcohol
-no coffee or other caffeine or even dark chocolate after 2pm
-daily exercise for at least 20 min
-write out my tasks for the next day so I’ve got things as much out of my head as possible
-If I can’t sleep or wake up, Get up and eat something small and protein-rich like nuts or cheese
-Don’t check phone in middle of night
-wear earplugs. It’s amazing how little noises wake me up. I use the soft moldable swimmer’s ear plugs