Bipolar disorder can affect every aspect of a person's daily life. The most common symptoms are extremes in mood, which can lead to disruptive behaviors. A person with bipolar disorder may be overly happy and energetic for long periods of time, followed by periods of deep depression. This can make it difficult to maintain relationships, keep a job, or even take care of basic needs. The mood swings can also be accompanied by changes in sleep patterns, energy levels, and appetite.