Why do we feel nostalgic?

You remember fleeting feelings, emotions and moments of glee. You do not remember the seconds of sadness and hurt before it. You don’t remember the pain and anguish of the hours after. You only remember what your biased mind has chosen to recall.However, as it turns out, nostalgia isn't about remembering memories at all. As Hirsh points out, nostalgia does not relate to a specific memory, but rather an emotional state.