Check out this article on “Snooze, you win”. It’s got some great information and will add to your list of excuses for falling asleep in work.

When billionaire adventurer Steve Fossett broke the record for around-the-world solo jet flight last March, he slept just 60 minutes in 67 hours of flight time — 60 minutes broken into two- and three-minute naps. “I slept when I needed it and awoke refreshed,” he says. Fossett, who holds world records in ballooning, sailing, and flying, adds that none of his feats could have been done without these micro-variety “power naps.”

THE NANO-NAP: 10 to 20 seconds Sleep studies haven’t yet concluded whether there are benefits to these brief intervals, like when you nod off on someone’s shoulder on the train.
THE MICRO-NAP: two to five minutes Shown to be surprisingly effective at shedding sleepiness.
THE MINI-NAP: five to 20 minutes Increases alertness, stamina, motor learning, and motor performance.
THE ORIGINAL POWER NAP: 20 minutesIncludes the benefits of the micro and the mini, but additionally improves muscle memory and clears the brain of useless built-up information, which helps with long-term memory (remembering facts, events, and names).
THE LAZY MAN’S NAP: 50 to 90 minutesIncludes slow-wave plus REM sleep; good for improving perceptual processing; also when the system is flooded with human growth hormone, great for repairing bones and muscles.

via mensjournal