The only time I have a sick day is when I'm truly incapacitated. I mean, I've got to have either a really high fever or throwing up all day or have a really bad migraine where I can't even keep my eyes open.
In a way I'm lucky that 3 of my kids go to school full time and the baby is at the sitter all day, so I technically could lie in bed. Not that it ever happens, because there are so many other things to do and just not enough hours in the day. I had one day recently where I just had to lie in bed with the migraine but even then I get a kid come and talk to me every 5 minutes.
Frankly I don't like to leave things in someone elses (DH's) hands, because then I have to clean up the mess afterwards.

It's not worth it being sick.