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“Combine naps and caffeine for ultimate midday refreshers
Got 15 minutes and a cup of coffee or tea handy? You’ll be glad you do, and that you’re keeping yourself from developing that daily tolerance. Because then you’ll have access to the “caffeine nap” discovered by U.K. researchers. Drink some coffee fairly quickly (assuming you aren’t already buzzing on the stuff), then take a 15-minute nap. That gives your body just enough sleep to feel slightly refreshed, and the caffeine enough time to start taking effect the minute you wake up.

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New work habit in 2012. 

How To Break Your Daily Caffeine Habit And Use Coffee Strategically | Fast Company