ok!
Doing things like puzzle-solving helps your brain shift into a gear where sleep is possible.
There's an app that may help to fall asleep to: https://mysleepbutton.com/en/home/
Free, no ads.
There's another one that does CBT-i (cognitive behavioral therapy for insomnia) and also has some wind-down tools like guided imagery.
https://mobile.va.gov/app/cbt-i-coach
I hope you can get some rest, I know you have a lot on your plate.