beds
When I was a boy my bed had a well-defined and understood head and foot; it had orientation, and a proper way to sleep.
My eldest treats her bed as a great big squishy thing on which sleep is to be achieved, through any and all means necessary.
My youngest begins the night in the usual north-south orientation, but for some reason always rotates 90° in her sleep, and ends up spending most of the night laying across the bed. (At least, until she stumbles into our room, throws her pillow over my head, and spends the rest of the night laying across us.)
My wife sleep on her tummy, and there’s no forgiving that.