There probably isn't a more overused term in all of fantasy football than "sleeper."
Says the guy who just used it in the title of this piece.
Every year, fantasy pundits far and wide roll out their lists for the top sleepers in a given season. Many of those lists contain the same players, which sort of defeats the purpose of calling that player a "sleeper" to begin with.
If everyone and their mother knows about a guy, he's not a "sleeper" anymore — he's officially awake.
However, this isn't to say that those "sleeper" lists can't be of great use to fantasy owners.