Once mastered, this technique need not be limited to the work environment. It can be used anywhere you're expected to pay attention, and would rather not. In other words, most of your waking hours. It's especially effective when you train yourself to emit little sleep noises that sound like attentiveness: 'hmmm", "uh-huh", and what have you. I even had a friend in college who became so expert at it that when his subconscious detected a lull in the conversation, he would say "go on..." while still sound asleep! One thing I've discovered: it doesn't matter how good you are at painting eyeballs. Even if people don't buy it, they say, Jeez, he went to that much trouble, let him sleep.