For a long time, I thought lunch was the problem. Every workday, the same pattern repeated itself. I'd finish eating, glance at the clock, and almost immediately begin fighting the urge to sleep. If I still had a few minutes before my lunch break ended, I'd rest my head on the table and steal a quick nap before returning to work. What puzzled me wasn't that I became sleepy. It was what happened around me. The colleagues who had eaten beside me were already walking back to work. Some continued chatting as they left the canteen. Others went straight back to their desks and started answering emails. The strange part? We had often eaten the same lunch. Yet somehow, they returned to work feeling refreshed while I felt like I hadn't slept in days. It didn't make sense. My Failed Experiment Convinced that I was simply choosing the wrong foods, I decided to stop making my own lunch choices. Instead, I copied my colleagues. If they ordered rice, I ordered rice. ...