When I awoke one day feeling nauseous, I tried at first to ignore the symptom. I went early to the office prepared to tackle my e-mails, which I try, Sisyphus-like, to clear away at first light. Soon, I felt severe nausea, now accompanied by light-headedness, and sweating. Having learned from experience, I quickly lay down on the floor and put my feet up. Within 20 seconds, I began to feel better, and a minute later, I had apparently quite recovered.