Many people run with their adrenaline system pumping in high gear all day long. This is not healthy. Our bodies are designed to cycle through periods of intensity and periods of recovery. Much like an elastic band; it can be stretched but to retain its effectiveness it needs to return to rest.
If you have been sitting a lot, get up and go for a walk. It will clear your mind and increase your efficiency. If you have been on the road and constantly talking for an extended period, do some desk or other work with less need to talk with others.