For the adrenaline aspects… I had insomnia for years from anxiety+ issues. I know it might sound silly, but doing breathing exercises helped me calm my heart rate down to have a better chance to fall asleep.
I do a version of the 4-7-8 Breathing Exercise at this site: https://www.verywellmind.com/abdominal-breathing-2584115 (I do more of a 4-5-5 and don’t bother with tongue placement. Just alternating nose/mouth breathing and holding breath in between.) It was recommended to me by a therapist and it helped my issues. I haven’t tried the other exercises on there though.
I do something like this, but instead listen to recordings of the animals from where I grew up. (Frogs chirping, rain in forest, and Barn Owl calls. Really relaxes me.) Also, I have found that if I watch a bunch of something that will make me laugh before laying down it helps. (Stand-up, comedy panel shows, Try Not to Laugh videos, etc.)