My impression was that he meant "required," as in "someone higher up said we have to have two controllers;" not as in "there's actually some sort of practical reason why we need to have two controllers."
For what it's worth, I'm a little unclear as to the "intentional" sleeping part. The article's not very clear. Did he decide to take a nap on the job because he was tired and nothing was happening, or was it some sort of dopey protest?
Either way, most employers take offense at employees sleeping on the job (unless they're, say, mattress testers). But I do think there's a difference between someone nodding off accidentally because of poor scheduling or boredom, and someone who just decides to grab a few Z's on "company" time.
-Rich