Note
That wasn't quite how it was supposed to happen. Somewhat to my surprise, I had trouble getting to sleep (partly I think through the time zone change, partly because I'd been working on something mentally stimulating too close to bedtime), then not long after I finally got to sleep I started cramping, badly. My assumption is that whatever it was I ate after Sunday (which was a dehydrating race because of the very high humidity) didn't have enough salt to replenish what I'd lost, and this was the first time I'd been lying down since then.
Decided I wasn't going to do any exercise until I'd done some salt replenishment through the day and had tentative plans of an evening swim, but that didn't work out either. At least I got a big report off to internal review just before I left. Did feel a bit better later in the day, although I have a bit of a cough - not sure if this is a cold or a remnant from Chinese pollution, although Guangdong is the least polluted part of eastern China (thanks to the combination of a nearby ocean, and regular winds and rain - unlike the Beijing area or the Sichuan basin, where dry stagnant conditions can persist for weeks in winter).