You’ll have better productivity if you’re well rested and not stressed. Make a good night’s sleep a top priority and take time to relax during the day for at least a few minutes every couple hours. Short, periodic breaks help maximize your efficiency. Take a 20 minute power nap in the sunshine or take up meditation. There are several good guided meditation apps available for your phone or tablet if you are a beginner. If nothing else, take a few deep breaths and clear your mind for at least a few minutes every day. You’ll get more accomplished and feel better while doing it.