“Hypomanic? Absolutely. But Oh So Productive!” by Benedict Carey (NYT):

In recent decades, scientists have found that bipolar disorder is widely variable, and that its milder forms are marked by hypomanias, currents of mental energy and concentration that are less reckless than full-blown manic frenzies, and unspoiled, in many cases, by subsequent gloom.

New research helps explain how people with manic or hypomanic tendencies navigate the small triumphs and humiliations of daily life, and provides clues to how some of them quickly shake off the emotional troughs that their ambitious natures should make inevitable.