Yeah, lots of people camp in their Jeep Wranglers! The easiest thing to do is fold the back seats down, move the front seats up, and throw in an air mattress or foam pad that fits the Jeep. Some people even make a simple wood platform to make the surface flat and create storage space underneath.
A table that attaches to the tailgate is useful, and window screens are good for keeping air moving while you sleep.
Will you be camping alone or with someone else? Knowing that will help figure out the best setup.