Except Darryl was still up. So he could have easily volunteered to take the first shift at watch. Rick would have told him to wake him up for relief in 3 hours, and Darryl just let him sleep.
I guess I have a bigger issue with how convenient the storm was. Strong enough to uproot trees and incapacitate all the zombies, but happened to miss the barn. At least when they pulled the same stunt in Z-Nation, they had enough decency to have one of the actors say "well, at least it isn't sharks."
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