Some days, you wake up, and you don't want to get out of bed. Because you're sick. You suddenly have a stuffy nose, a thick and scratchy throat, and a splitting headache right behind your eyes. It's not pneumonia or the plague, just a seasonal bug. A bug which most people will still go to work with, and which many people are expected to come into work with. (For better or for worse -- but that's a discussion for another day.)
And then, there are those of us who do the majority of our work from home. Clients on the other end of emails can't tell if we're sick. Just avoid videoconferencing, and it's possible to stay in your pajamas all day, propped up by pillows in bed, with a cup (okay, five) of tea and a slice of toast and a glass of orange juice and a bowl of applesauce and some soup, all close at hand. No one will know!
Oops. Probably blew my cover. You all know! My secret is out. Aaaaaahhhhhhhhhh*coughcoughcough*...... Oh well. No use getting worked up over it. I can still work, and work well, at that.
Ah, the blessings of a freelancer.