It's the heavy eyelids. It's the tightness in the back of your mouth. It's the coughing of phlegm. It's not being able to concentrate on anything. It's the cloudy feeling in your head. It's the detachment from your body. It's being aware of the place where your nose opens into your throat. It's shivering uncontrollably. It's not being hungry when you should. It's achy muscles. It's muffled hearing. It's the dizziness. It's the runny nose. It's wanting nothing more than to be tucked in under your new down comforter. It's knowing that you're getting sick.