Go to sleep. If I can't sleep, I lay in bed over-thinking. I now have Melatonin available to me to take if my Trazadone doesn't knock me out. I know that getting onto electronics is a bad idea when you can't sleep, so I try and read books until I get sleepy. If not, I wait until the morning to crash.
That is a good question. I can't get my mind to slow down enough to go to sleep at night.
Ballet.
There's no room to think about anything else.
Jigsaw puzzles on line! Pick your puzzle, # of pieces, pieces shapes, background colors, etc.
Free, too! I like "Jigsaw Daily" and " Jigsaw Puzzle Epic"- the one most like doing one on a tabletop.
Read an interesting Kindle book until I get too sleepy to sit up.