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Hypomania (literally, "below mania") is a mood state characterized by persistent and pervasive elevated (euphoric) or extreme happiness which is sometimes followed by an irritable mood, as well as thoughts and behaviors that are consistent with such a mood state. It is most often associated with the bipolar spectrum. Many who are in a hypomanic state are extremely energetic, talkative, confident, and assertive. They may have a flight of ideas and feel creative. Many people also experience signature hypersexuality. While hypomania often generates productivity and creativity, it can become troublesome if the subject engages in risky behaviors. It is generally less severe than full-blown mania.

http://en.wikipedia.org/wiki/Hypomania