"They challenge me every way you can be challenged to think things through, and believe me — and I hope fans understand that — those decisions are taken very seriously. It's not just sitting there saying, 'Oh, yeah, it's easier to keep anybody.' Actually, it's easier to do the opposite and everybody's happy for a little while," Harbaugh said. "What is it going to take in every single area for us to go out there and play the kind of football we want to play and we need to play? I lay awake at night thinking about it, driving to work, driving home on what the best way to do it is and who the best people to do it are, and that's the conclusion I came to."