Atypical Depression
Atypical depression is a syndrome that shares the symptoms of major depression or dysthymia, yet sees temporary improvements in mood in response to positive life events.
This type of depression can also share the symptoms of melancholic depression such as increased appetite/weight gain, hypersomnia, and heavy sensations in the limbs - any of which can cause impairment in a person's ability to function in the world in areas such as employment, social settings, or relationships.