"I can't exercise today; I'm sick. I can't do laundry or clean the bathroom or run errands, either. I need to rest, which means lying on the couch in my comfiest, slouchiest clothes, watching Jane Austen movies on tape. I'm too sick to eat salad and whole-grain bread; that stuff's only good for you when you're healthy. Right now I need soft, comforting food like matzo ball soup and ice cream. And I'm only going to read fluffy novels today, because serious books full of useful information are just too tiring." And so on.
Not that this is really enough to make up for the raw throat and dripping nose and general ickiness, but it's something.