Every morning I heave myself out of bed at 4:30 a.m. and sleep-drive myself to the gym. (Sleep-driving? It's like sleepwalking, only more dangerous). But some mornings I give myself a break, get up later, and take a walk. This happens more frequently now than it does in winter, when a walk might mean frozen ears, sleet lashing the exposed skin of my face, and icy patches on the sidewalk turning me into a bad imitation of Tonya Harding. Now, the sun is up at 5 a.m., and the morning is bright...