is a fact that thinking and other forms of mental activity and concentration of consciousness requires nervous energy. Physical activity and muscle of any kind also requires any nervous energy and may be tired, exhausted and tired of nervous energy due solely to mental activity, as easily as when it comes to physical activity. Brain fatigue is as real as muscle fatigue, but from the moment the lower body physical activity, is released a greater amount of energy in the physical body to be used by the brain and the brain uses this extraordinary amount of energy to get into unusual activity. After a person has eaten a lot needs to be very active in nervous energy for digestion, and the brain is not a lot of nervous energy available to be used in a lot of thought, analysis and reasoning, and for this reason students, men and women who need to think, analyze and think deeply, have observed that it is impossible to use your brain and mind in an effective manner immediately after a meal exaggerated. For this reason it is easier to learn by heart before and after eating at rest rather than when some exercise. Many of the individuals most scholars in the world and most of those attending colleges and universities, who have to prepare their exams or given special studies have shown that the early hours of the morning, at sunrise, and before breakfast, are Best of all to read and memorize, because the body is resting and not consume much nervous energy, and as the stomach is empty and you are not making any other active role the brain can use a lot of nervous energy for understand what the eyes are reading and record it in the memory store.
We have been given spiritual energy. That divine and sacred mystery that holds the human existence. The divine breath awareness has given corruptible matter. 
People who suffer more severely by the inability to concentrate, admit that at the time trying to concentrate and focus your attention and consciousness in thought or idea, or when trying to obtain the repository of memory any of the information, all slightly relaxes the body and instantly the brain begins to work with the greatest activity. It appears that such persons, the lowest level of physical relaxation, the slightest pause in the activity. causes the brain to work more activity than at any other time. Such people suffer from insomnia, because when you have to sleep and relax the physical body, the brain goes into unusual activity. Even when in a vehicle or walking leisurely or they try to relax the body in the theater or during meals, by declining physical activity produces an overabundance of mental activity. 
First we must understand that human consciousness is a mechanism and a very complex psychological functioning. The human brain is like a large electrical control board that would manage the operation of the body's nervous, particularly those functions that are entirely voluntary. There are many involuntary functions in the body, which are not controlled by the human brain by use of the will. Usually included in this category the heartbeat, the rhythmic action of other bodies reaction to certain nerve impulses throughout the body, and activities, something more mysterious, lungs, stomach, intestines, kidneys and bladder, for example, maintaining normal activity. Fortunately for humans, these important functions were not entrusted to the voluntary and arbitrary handling of man. Taking into account the way the man neglects those functions whose management has, is truly a fortune to the man his brain and will not have full control of all activities that constitute the human body and its living state and consciously. However, the understanding that man has of his consciousness requires a focus, and this approach has to be made in the brain and purpose of the operation center of consciousness in all parts of the body. 
In the Western world supports people who think generally the most serious obstacle encountered in their daily lives is the ability to focus attention and focusing on inner awareness and willingness easily. 
The black is a mysterious color associated with fear and the unknown (black holes). It usually has a negative connotation (blacklist, black humor, "Black Death"). The black denotes strength and authority, is considered to be a very formal color, elegant, and prestigious (black tie, black Mercedes). In heraldry, black is the symbol of grief. 
, commonly referred to as a color, is actually the absence of light 
