Tossing and Turning

If you are having difficulty getting to sleep because you cannot stop fretting about the erosion of English grammar, it does not help to discover that the herbal remedy you have chosen to help you get to sleep is actually part of the problem:

I remain one of the people 'whom' have difficulty falling asleep - in fact, my problem's worse than ever now.

Result of the Canberra Education System

I presume 'debris' was the word the signwriter was searching for.