Children and adolescents who demonstrate exaggerated mood swings that range from extreme highs (excitedness or manic phases) to extreme lows (depression) may have bipolar disorder (sometimes called manic depression). Periods of moderate mood occur in between the extreme highs and lows. During manic phases, children or adolescents may talk nonstop, need very little sleep, and show unusually poor judgment. At the low end of the mood swing, children experience severe depression. Bipolar mood swings can recur throughout life. Adults with bipolar disorder (about one in 100) often experienced their first symptoms during their teenage years (National Institutes of Health, 2001).