Most scientists believe that when we sleep, we allow time for essential maintenance work to be done. Any ________ there is can be put right more quickly if energy isn't being used up on other things.
In this FCE multiple-choice cloze I need to pick between harm and damage.
From the research you can find in the hyperlinked sources, both words can be used metaphorically. However, why does only the latter work? (At least that's what it says in the key)