I'm really not good at "doing nothing," most of the time. Even when I'm sick, I've been known to work on projects.
Every so often, however, I will take advantage of a day off to do
Sleeping in, lounging around in sweats, playing on the Internet, reading 1.5 books, snuggling on the couch ... like so:
It was wonderful. (Although, I admit, I did sneak in work on a couple of minor projects.)