Last time I stayed at my Mom's house in Seattle (with no AC and the upstairs bedroom windows nailed closed for some insane reason) we did the "move the sleeping arrangements to the ground floor" thing and laid out mattresses for the four of us in Mom's office near the back door. This was during a 90^o heat wave in Seattle, something we could manage in Texas, but not in a hot upstairs in Seattle with no moving air at night.