What affective manifestations accompany fatigue? What are the characteristics of mental fatigue? What activities help us to rest? How to improve the quality of sleep? Why laughter and good humor help to rest? How to achieve a psychological balance that prevents burn-out? How is rest related to happiness? How to avoid worries? This book is the fruit of many years of professional dedication to treating physical and psychological problems related to stress and anxiety, caused by excess work or having to meet deadlines, without taking time off to relax and recover one's energies. In other words, the problems derived from an imbalance between tiredness and rest.My main purpose is to show how to prevent psychological fatigue (both emotional and intellectual), especially the tiredness that accumulates over time and ends up becoming chronic. This kind of tiredness passes unnoticed for years, and is not easy to treat. Physical tiredness, however, is easy to detect and remedy.Fernando Sarráis, has a Bachelor of Medicine and Surgery from the University of the Basque Country, a Doctor of Medicine and Surgery from the University of Navarra and a Bachelor of Psychology from the National University of Distance Education (UNED). Specialist in Psychiatry, since August 1998, he also works as Adjunct Professor of Educational Psychopathology and Social Psychology at the University of Navarra.