Here's the drill: slept insufficiently Sunday-Monday; went into work in the middle of the wee small hours Monday, worked ten hours, came home, stayed up as long as I dared, slept twelve hours -- fitfully at times -- and woke up with my back feeling like a rusted-stiff roller chain that had been stuffed into a microwave oven set on "high."
Soaked in hot, Epsom-salted water for an hour and I'm better now. Why, I feel as spry as any centenarian! Or most of 'em, at least.
4 months ago