During the past few years, Lester has experienced several episodes of devastating sadness, weight loss, feelings of worthlessness, and an inability to concentrate. Recently, Lester is experiencing tremendous elation, excessive excitement, racing thoughts, and elevated self-esteem. He has not slept for several days, claiming that he no longer needs a full night's sleep. Which diagnosis will Lester most likely receive from a clinical psychologist?

Individuals who suffer from bipolar disorder alternate between states of manic (increased activity) and depression.