Best bet is to leave work for lunch. Sit in your car if you have one, wearing sunglasses. Best if your car has tinted windows. If your building has a parking ga

Best bet is to leave work for lunch. Sit in your car if you have one, wearing sunglasses. Best if your car has tinted windows. If your building has a parking garage, that is ideal, less chance of random person thinking you are dead and calling the cops. If you don't have a car, bathroom stalls might work, if you can find a clean spot where you can sit on the toilet and lean your head against the stall wall. Wiping down the area where you lay your head with hand sanitizer might be a good move. Some libraries have private rooms you can reserve for studying. If it's too hard at your job, you may have to decide whether it's worth changing jobs. It sounds silly, but if taking a siesta would have a significant positive impact on your productivity (and it does for many people), then changing jobs is a reasonable step IMO.