If I were your boss, I'd tell you to follow up that nap with a coffee and then GET BACK TO WORK :) But.. there is the alternative theory of the "caffeine nap"

If I were your boss, I'd tell you to follow up that nap with a coffee and then GET BACK TO WORK :) But.. there is the alternative theory of the "caffeine nap" a.k.a. "coffee nap" - that you have coffee just before your nap, and then the coffee's first effect (dilating blood vessels) helps you fall asleep before the second effect (increased alertness) kicks in.