I am technically an SI polr and also an Sp instinct last on Enneagram. it does show in my everyday affair, especially when I was younger I have horrible time keeping in touch with my body and what it needs to function at the best optimal level. So i usually crash at the end and get nothing done. now a day I protect my polr better and just little changes in life like stop smoking, stop or slow down your action periodically definitly results in better work at the end. as opposed to unwanted breaking night because I don't feel the sensation of how caffeine affects my sleep. I regret it a lot now that my body programs night as day, and been like that since 12 since I sleep at 8am and wake up at 6pm for a decade. It's like it's program like this no matter how hard I tried to switch this body clock. it is physically unable to allow me to, resulting in so much miss opportunity in life.