Step 1: Around lunch time, in a very nonchalant way, stroll out to your car, set your watch/portable-alarm-clock/cell-phone-alarm-clock to wake you up near the end of your lunch break, tilt back the seat, and zzzzzzz.....
Step 2: After waking, splash cold water on face, then eat your lunch at you desk.
Step 2: After waking, splash cold water on face, then eat your lunch at you desk.