Good research, he's the exact age at risk for Delayed Sleep-phase syndrome.
I did a study on a 13 year old boy 2 weeks ago with the same problem, he just layed there watching TV, and then layed there in the dark, no video games no TV to distract him for hours without sleeping growing more and more frustrated.
Very simple solution, go to the doctor and get sleep aids. He should only have to take them until he gets his circadian rhythm back on schedule.
Also make sure he avoids the following 3 hours before bedtime, caffeine and exercise!