Psychologically, mania is described as a mood disorder characterized by euphoric states ,extreme physical activity ,excessive talkativeness, distractedness, and sometimes grandiosity. During manic periods a person becomes "high" extremely active , excessively talkative, and easily distracted. During these periods the affected person's self esteem is also often greatly inflated. These people often become aggressive and hostile to others as their self confidence becomes more and more inflated and exaggerated. In extreme cases like Hamlet's the manic person may become consistently wild or violent until he or she reaches the point of exhaustion. Manic depressives often function on little or no sleep during their episodes.
At the opening of the play Hamlet is portrayed as a stable individual . He expresses disappointment in his mother for her seeming disregard for his father's death. His feelings are justified and his actions are rational at this point, he describes himself as being genuine. As this scene progresses it is revealed that Hamlet views himself as being weak: "My father's brother, but no more like my father/ than I to Hercules" (1.2.153) The doubts that Hamlet has concerning his heroism become particularly evident in his actions as the story progresses.