Physical Brain Tiredness Syndrome (PBT-S).
President Obama has over the top intelligence and has wisdom. He is also over exuberant about his presidency. He is a hands on president. He takes in advice from different experts on each and every topic and he tries to become an expert of every policy issue; down to the last detail. All this heavy duty absorption of knowledge tires the mind. Even when the mind is over worked it is the physical brain that does the thinking through biochemical action/reaction. In the process the physical brain gets tired. Again when the body and mind are sleeping/resting the unconscious brain starts to review/sleep-over the mind absorbed knowledge. Similarly 80% Americans have a overworked brain.
Americans must indulge our brains in relaxation every day.