To me it’s like a drug. You can grow a tolerance to it but if you don’t take it for a while, it will kick back in if you like the drug. I think this is why many who do drugs love listening to music. I am 40 now and stopped doing such things in my mid 20s, though. lol Your body can produce all sorts of drugs on it’s own. Like staring off into space. Here is a new one that does it for me. Starts at 3:26 and fully kicks in at 4:11.