What is the definition or description of: hypomania?

Hypomania: Hypomania is a state of mind characterized by sustained, elevated, expansive or irritable mood, plus unusually and persistently increased activity for most of the day over at least four days. The degree is less than full mania. The person is easily distractible, yet may be driven to accomplish many goals. Thoughts are rapid; speech can be pressured. May get by on little sleep. No psychosis.

Milder mania: Mania is a hyperarousal state, like having the motor on a dial turned up too high. A person in a manic state may have less need for sleep, racing thoughts, rapid speech, irritability or elevated mood - just to name a few symptoms. There is not always a clear distinction between hypomania which is a milder form and mania. Generally psychosis defines mania and mania creates more dysfunction.