Camping in a BMW X3 SUV
There's enough room to sleep in a BMW X3 if it's just you, and maybe enough for a very close couple if neither of you minds being tight on space. I tested this setup by myself, and at a little over 6 feet tall I was able to fit by moving the front passenger seat all the way forward, folding both rear seats down, and sleeping on the passenger side.
What surprised me is that space wasn't really the biggest problem. The bigger issues were heat, bugs, and how the mattress handled the transition where the flat cargo area runs out. My cheap Intex mattress was actually fine, and the rear headrests helped support the head end more than I expected once I extended them, but I still stuffed clothes underneath that area to give it some extra support.
So yes, sleeping in a BMW X3 can work. It's not just about finding a mattress that fits. You've also got to figure out how to stay comfortable once the flat cargo floor runs out, how to keep cool on a hot night, and how to get airflow without letting the bugs in.
