I totally get where you're coming from. When I quit smoking a while back, my sleep went downhill too. I had issues with insomnia and even had a racing heart at night, so I had to start taking beta blockers just to keep it under control. I also noticed that anything that got my heart rate up, like exercise or even getting too excited, would ruin my sleep that night. For me, trying to keep my evenings as calm as possible helped a bit – I’d avoid anything too stimulating before bed, like movies or intense conversations. It wasn’t an instant fix, but it made things a bit more manageable. It sounds like the adrenal thing could be playing a big role, and maybe talking to your doc about ways to manage that could help.