Next week my parents are coming to stay for a night, so I’ve just cleaned the guest room sheets and made the bed fresh for them. Two days later, we are having a dinner party and a friend has just asked if she and her partner can stay over. AIBU to think that it’s OK not to change the sheets?? It just seems insane to change the sheets after one use, and both my parents shower before bed. But part of me also thinks this isn’t OK. Advice please!