If sickness in your child leads to night wakings, how long after the illness is resolved do you wait before trying to sleep train / not respond to night waking?

R had a bad fever from Friday - Monday (102-104) and a nasty cold and cough. He now just has the cough. It's Wednesday. He was previously STTN but now is waking up every night. Wondering when I should not respond / try to let him work it out.