Yeah, my uncle is the same. They've been falling through space, fighting in broken space ships and my uncle even slammed into one once. I don't know if they can keep it up forever. They definitely breath but at least for a while they aren't too fussed about it. It's super annoying. Mum and I always have to worry about leaving a craft and Dad is like 'why are you taking so long, I'm out here waiting'.