Dr. Free-Ride has a post Thanksgiving cold. I'm convinced that she's not the only one. I frequently get sick during school breaks, weekends, or vacations. Neither Beorn nor I were sick during the break, but by Monday morning he was definitely sick and now I'm starting to feel it. Here's my explanation for the phenomenon...During times of stress your immune system is on overdrive. When that stress lets up, your immune function drops.