Me: "Ok, time to get ready for bed. I want you in bed early tonight. You need rest.
Desmond: "I don't think I'm sick anymore. I feel fine! I don't need to go to bed early."
Me: "You must be really excited to go back to school, then."
Me: "If you're not sick, you can go back to school tomorrow."
Des: *cough, cough* "I'm still sick.