With young people it isn't a matter of running them tired and bypassing the problem. Most aren't actually mentally ill, rather for the first time in their lives they don't have someone telling them how to live their lives on a daily basis. So they are given structure until they can work that stuff out for themselves. Extra work is often part of that structure. For instance, I know of one 19yo who was basically bored to death at work and hitting the bar every night (not in the US). So his boss put him on the unit "safety committee", which is extra work. He then had to interview people and write a monthly report to be read by the CO, which is very scary for the average 19yo kid at his first unit. That little bit of responsibility, extra work, turned him around real fast. He came to my office to have me edit his first report. He was nervous, but prideful nervous rather than scared. He didn't have bags under his eyes anymore.