In the initial stages after transplant when my husband struggled to sleep in the middle of the night, we would play meditations off the phone app. That usually got him back to sleep.

I can’t tell if you’re male, but if so, we also continued to use the urinal so that he didn’t have to get out of bed - deal with pain of sitting up and walking to restroom- allowed him to stay drowsy and more easily get back to sleep. You can buy the chucks on Amazon to keep the bed clean.
But try the meditation apps, it distracts your mind from whirling around and thinking about all the things that make you anxious.
It is a season in your life, accept and embrace the new beginning. Soon you’ll be playing pickleball, skiing, bike riding- whatever your thing is- and you’ll have no trouble sleeping. Wishing you all the best.