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.

[–] Helix@feddit.de 1 points 1 year ago

I tried 4-7-8, 4-4-4 and everything in between. For me it's mostly being aggravated, not having anxiety. I sometimes get bursts of inexplicable hatred which make my heart go brrrrt and my blood pressure go up so high my ears ring.