In the days before something exciting will happen, I always feel this slight but persistent adrenaline rush in my chest which makes me jittery and affects my sleep. I need to play all sorts of mind games to calm down before bed, especially the night before said event. 

Something that helps mitigate this feeling is by "commanding myself to chill", where I try to talk to my subconscious and ask it to chill out, relax. It works for a little bit, but any reminder of such exciting event instantly spikes my adrenaline and I'm back to where I started.

Anyone else? What are your techniques on dealing with this? I've gotten better over the years but it still affects me in a very annoying way now. I just wish I could do these things without overthinking them a million times over.