What is keeping your favorite NFL coach up at night?
Of course, NFL coaches get very little sleep anyway—especially during the season. With game-planning and tape watching to do, most coaches live in their offices and rarely see their families or the backs of their eyelids.
So, when coaches do get precious time to rest their weary heads, what is making each coach toss and turn?
Sometimes it's injuries at key positions. Other times, it's lack of depth in critical areas. Some coaches have that one opponent that perennially has their number, and other coaches have divisional opponents that are looking more and more fearsome each season.
So, what is your team's biggest worry heading into 2012? Click ahead.