Robert Thayer, a specialist in human mood, says so about his favorite subject of research: “If we understand that it is our mood that emphasizes the meaning of certain events and enhances or weakens the pleasure that we receive from them, we will realize how important it plays.” We are used to thinking that our thoughts and feelings are causing a changing mood. Thus, if a person’s task is mostly to be in a good mood, he goes to a psychologist or tries to analyze his thoughts of feelings on his own. However, this approach to the causes of mood changes is quite narrow, since very important factors that also determine mood are out of sight: sleep, general health, physical body sensations, food, and everyday rhythm of life. In fact, mood is the result of processes occurring both in the mind (thoughts, emotions) and in the physical body. Unfortunately, if our well-read, psychologically savvy contemporary draws his attention to what is happening in consciousness, he will pay attention to