Maybe those posters that are super clean, make their own beds, clean out the trash, use a ratty towel multiple times or days, should place their magnetic sign with "Sleepint it off" and take it off when they want cabin service.
I had a passenger adjoining my cabin on Anthem, that had the sleeping sign on for at a minimum 85% of the time. The only reason that I knew the cabin was occupied I heard her loud voice one day when my balcony door was open. Maybe she was a member of the test group.🤣