Best I can figure, I wrenched my knee sometime last week. It hurt at the time, but the real killer was several days (like sim lab clinical) where I had to stand for hours without being able to move around much-- until that, even a fair but of walking didn't feel bad. Trying to rest it up this week. Monday seemed much better, but I keep waking up with ouches. Took half a pain pill to sleep tonight, and it's helped a bit, but not much. I'm awake now at 1:15. Hoping this is not the harbinger of major knee problems to come. I can't afford infirmities!