[header] How to treat atypical depression [title] Recognize the symptoms. [step] Like other forms of depression, atypical depression can be caused by a mix of contributing factors such as genetics, environment, childhood trauma, and brain chemistry. The symptoms of atypical depression include : [substeps] A mood that can lift due to positive things happening in your life. 
This differs from mdd, in which the mood is usually depressed even in the face of positive events. Hypersomnia, which is sleeping longer than normal, either at night or during increased napping during the day.