Take short pauses throughout your day.
These little breaks allow your mind to rest and recuperate. Without them, your mind will become exhausted, and you will get sloppy and make bad decisions.
Research indicates that the best way to solve a problem is to work hard on it, and if a solution can’t be found, to just let it go for a while. Do something that relaxes and distracts you, and your unconscious mind will help you find the solution.