Depression is not visible. It does not have a chemical mark or there might be seratone and shortage andou insufficiency wo every one call it. The fact that depression has risen in the united states could be simply an increase in the diagnosis, but not the phenomenon. People who are depressed tend to experience in their sleep a lot of what are called mic awakenings - where you you wake up slightly when you're asleep. So people who depress tend to higher levels of micro awakenings. And so we do know because he did a very good study with a group like the armish, Was another group who live much more like huderites than amish. You can infer