In an article for Scientific American, Mr. Amir surveys recent brain studies. The summary of research from many scientific teams and universities (Yale, Maryland and Minnesota, to name three) concludes the brain is like a muscle that can be depleted or exhausted when it comes to regulating attention and making decisions. Since life is a series of ever-streaming possibilities from which we must choose as chief executives of our lives, this scientific finding is very important. It tells us trying to focus on a single task for long periods or making decisions (especially those requiring resistance of temptation) tires our brains and leads important decisions made in their wake result in inferior choices. So, when we have a big decision to make, we should let the little ones go (for awhile), as well as focusing for a long time on a particular task; our well-rested brain will thank us and reward us by making a better decision. This research gives new heft to the old saw: "I better sleep on it."