Crazy

I will be using the term "crazy" to mean mentally ill, or anything else you could think it'd mean.
Do crazy people know they're crazy?
How many mental illnesses are there?
What is common treatment for them?
When was craziness first treated as a disease? (As opposed to possession by demons as was common back in the day)
Are most crazies born that way, or do they become crazy?
What was the first insane asylum?
How many people have mental illnesses?
Can crazy people be cured?
Which famous people have been crazy?
What demographic is the most crazy?
Who decides if someone is crazy?
Who has the right to?