Which disorder do people alternate between states of lethargic hopelessness and wild over excitement?

The disorder in which people alternate between states of lethargic hopelessness and wild over excitement is known as bipolar disorder. Bipolar disorder is a mental illness that causes extreme mood swings that include emotional highs (mania or hypomania) and lows (depression). During a manic or hypomanic episode, a person may experience increased energy, racing thoughts, decreased need for sleep, impulsivity, and euphoria. In contrast, during a depressive episode, a person may experience feelings of sadness, worthlessness, loss of interest in activities, and low energy.