a psychiatric state characterized by euphoria, excessive activity or talkativeness, poor judgment, and, in certain circumstances, psychotic symptoms (megalomania); expanded to indicate "enthusiasm, frequently of an intense and temporary nature" for the original element (bibliomania). The term also may be applied to a morbid interest in books or book collecting. Manic-depressive disorder is when someone has this condition along with major depression. They can feel sad, happy, excited, or irritated. There are different types of manic disorders. Bipolar I disorder is when people experience episodes of mania and depression that last at least two weeks each. Bipolar II disorder is when people have periods of elevated moods and normal moods but they also have several other symptoms of a mental illness. For example, they might have problems with attention or sleep or have suicidal thoughts. This type of bipolar disorder does not meet the criteria for mania or depression alone but it still causes serious problems in someone's life. People with bipolar disorder need to stay on their medication so they do not go into a manic or depressive state. If they stop taking their medicine, they will soon begin to feel bad again. When something unusual happens to someone with bipolar disorder, such as losing his job or breaking up with his boyfriend/girlfriend, he needs to know how to deal with these feelings himself so he does not fall back into a state of depression or mania.