Was just making the bed in the guest room (formerly my mom’s room) for a guest who is coming for a couple of days. It’s just a full mattress, and it surprised me how small it is. My exH and I slept together on a full mattress for most of our relationship, until a few years before it ended. We are normal sized people - he 5’10” 170 lbs with a muscular surfer build, me 5’6” and 120 - 150 lbs throughout that time. We slept quite close, obviously.
I only changed it to a queen bed when he had had his affair about 8 years before his final departure. He was planning on moving out (had put down a deposit on an apartment) so I ordered a queen bed. I figured I wouldn’t want to sleep on that same bed where we’d spent so much of our marriage, and that if I dated, a new man might not fit in that small bed (little did I know that years later, when he finally DID leave, that I would date a virtual basketball team of very tall men! )
I think that act was actually part of what finally made him turn around that time. It hadn’t seemed to occur to him that I might date other men if he left.