I do it from time to time at that location, I will have dinner late and then go back to my truck and go to sleep 4 five six hours when I wake up at 3:45 a.m. of course there's no one there they've left and no one has ever said anything to me but I'm gone before they reopen, could be different story if you're still sitting there when they come in to reopen. If you don't ask you're not told no and if you do it like that you'll be just fine, enjoy your stay at Cracker Barrel LOL
No its not allowed.
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