Not in the vanilla game there isn't. Vanilla = no mods. If you've got a personal computer, there's probably several mods to choose from.
If you've only got PS3 or Xbox, it may be possible to
roleplay this somehow. Don't quote me on this, but I think there are some beds in guard areas which can be slept in. You'll have to bring in your own food, though, if you try and eat their food, you'll get
STOP! YOU VIOLATED THE LAW!!!
yada yada yada :rolleyes:
I imagine it would be pretty dull playing a guard. Eating, sleeping, standing guard for hours. Repeat. What are you plans to liven this activity up?