Ah! I slept in until 10:00 today, and generally poked around the house until 1:00. The added sleep (and the fact that the antibiotics are kicking in) has done a world of good. I'm still hacking and coughing (and will be for a while), but I'm not as bad as before.
Unfortunately, I have to finish a paper for a conference deadline by tomorrow. Since my coauthors "ain't from around here", my job is (as one says) to "Englishize" the paper. I'm really just correcting the more egregious grammar mistakes. But it takes time, and I'm taking longer than usual since I'm not firing on all cylinders.
In the meanwhile, here's a cartoon from Phdcomics.com. It pretty much describes my experience in grad school.