GO LOOK UP SLEEPER TROLL, IN THE FR DICTIONARY!
I didn't see SLEEPER TROLL in the FR dictionary but, I did find this:
Tin-foil hats -- The phrase [I believe] originated with suspicious people who felt - or imagined - they were being bombarded by mind-control or thought-implanting radiation of some sort (not sure by whom, whether the government or extra-terrestrials -- maybe both), and claimed that they gained relief by fashioning a simple helmet from aluminum foil and wearing it.