They call it a common gesture of courtesy to inform people that your home would offer itself to those fleeing some kind of devastation (oppressive regimes, abuse, earthquakes, etc.). However, most people don’t end up in that kind of humanitarian role. What’s the closest you have come?
Top bunk. My folks invited someone to stay with us when I was in high school and they slept four feet above me.
Can’t say I’d be so generous as to invite a stranger into my house like that as an adult. Maybe. I would certainly help with other sorts of disaster relief but it’s tough for me to envision a situation in which I would open my home.