Your body is meant to have the PNS in the driver seat most of the time. PNS allows your body to heal and take care of maintenance. SNS is like a wrecking ball to our inside, or better yet, a bull in a China shop (although, I can’t think of any time I would want that).  It’s great for short term when needed but not 24/7. You are being exposed to epinephrine (adrenaline) and cortisol all day long.  You will not only be on edge and have anxiety, but you will also have a difficult time shutting down to go to sleep.