Audi

You can sleep in the back of the Audi A4 Avant easily – even without any camping conversion – the rear seats fold down flat, tilting upwards slightly, which is ok for sleeping (might depend on the model). It’s long enough if you only put a mattress down (not too thick), and it’s also tall enough to sit on your bed. But of course, it’s still an estate – not as big, especially not as high in the boot as MPVs.