I've never heard of that, but then again I don't know many other depressed people aside from myself. I believe that depression is cured from finding all of our unmet needs and moving to fufill those needs. Maybe if a person was only depressed because he couldn't find a job, then got one the next day one would see that kind of a drastic change. It seems there are more unmet needs for most, and thus take longer to achieve happiness.