Bipolar disorder (also known as manic depression) is an affective disorder that causes periodic mood swings in which they cycle from depression to mania. Depression may be characterized by having a lack of motivation, difficulty doing tasks, short attention span, decreased appetite, crying spells, difficulty in getting to sleep or sleeping too much, and in the more severe cases thoughts of self harm. Mania is separated into two types: Full mania and hypomania. Mania may be characterized by a decreased need for sleep, decreased self-control, overspending, increased sexual activity, irritability, rage, risk-taking behaviors, and in the more severe cases psychotic states. Hypomania is described as having the same behaviors, to a less extreme level.