Katx: It's different for every person.

I'm aware. However, in bipolar disorder, depression is one of the episodes, and in general, not an emotion. A mixed state is where you have two symptoms of either episode at one time. How can a person be happy in a depressive episode?
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Maximus:
I knew a man who once said, death smiles at us all. All a man can do is smile back.
- Gladiator