I've been struggling with the sleep as well.

Research sleep hygiene, for starters.

Set yourself a "no screens" curfew every night. After that time, don't touch anything with a screen (or anything else that causes stress and mental stimulation). I set mine about 2 hours before I go to sleep.

I use that time to clean, cook for the next day, read, and walk my dog. I often think about increasing it to 3 hours, since it boosts my quality of life so much.

And the two go hand in hand. :)