hypomania /-mā″nē·ə/ [Gk, hypo + mania, madness] , a mild degree of mania characterized by optimism; excitability; energetic, productive behavior; marked hyperactivity and talkativeness; heightened sexual interest; quick anger and irritability; and a decreased need for sleep. It may be observed before a full-blown manic episode. −hypomanic, adj., −hypomaniac, n.