After several weeks of feeling apathetic and dissatisfied with his life,Mark has suddenly become extremely cheerful and so talkative he can't be interrupted.He seems to need less sleep and becomes irritated when his friends tell him to slow down.Mark's behavior is indicative of

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Mark's sudden change in behavior, increased energy, and decreased need for sleep are all indicative of a manic episode, which is a characteristic of bipolar disorder. The fact that he becomes irritated when asked to slow down also suggests this possibility. A major depressive disorder or persistent depressive disorder would not account for the sudden shift in mood and energy level, and learned helplessness does not involve the same symptoms.

After Several Weeks of Feeling Apathetic and Dissatisfied with His