We've already mentioned the role of anosognosia in personality and mood disorders. The video below (7 min) was made by a man with bipolar disorder who is now properly managing his condition with medication and therapy. He gives a 1st-person account of what anosognosia is, what it feels like, and why attempting to deal with a person who has a personality or mood disorder can be such a struggle. For more on anosognoia see the NAMI article.