Con crud: A vague illness that has a tendency to flourish and spread at gatherings such as conventions. It can be exacerbated by immune system stressors such as lack of sleep and dehydration from prolonged non-stop travel. (Definition swiped and modified from here.)
I think I got about my usual amount of sleep, just not at the usual times. I made a good many stops to stay hydrated on my travels. That made a 12+ hour drive not too big a deal. I've also been taking Halls Defense (vitamin C) even before RCFM as a preventive measure.
The good part is that I don't have a headache or nausea or anything really really nasty. The bad news is that I do have a sore throat. Hopefully that's all it will be, and hopefully I'll be feeling back to normal (yeah, yeah...) for Siouxland.