Give clients to friends or tell client it will take you a few days to finish their website because you want to make sure it is compatible in every browser, Vaild XHTML/CSS, and appealing to others.
hope that helps
A few days ago, I was sick. I had a pretty nasty headache and a bad sore throat. I had 4 design clients to tend to, and I was totally not up to doing any work.
As a freelancer, what are you supposed to do when you have a bunch of clients but are feeling sick? I tried to budget my time between sleeping and working (which was hard because sleep is much more fun).
How do you take care of clients when you're a sick freelancer?
I completely agree with Corey you should not exert yourself.
And also, almost all designers have a TOS, you should get one too.
And one more thing, as soon as you realize you cannot do the work, let the client know.
Don;t waste the clients time.
If i am sick and can't write my articles I just ask for an extra day or two.