Originally Posted by pinniped

The Westin Kansas City has (or had, anyway) little Murphy rooms. Perhaps they were originally there with the idea that they'd get booked as day-use rooms or something, but we'd do a stay or two there each year where I'd always get an offer to add one on to my regular booking for an extra $40. With 2 small kids at the time, it was an easy call. It was a little odd-shaped room at the end of the hall that adjoined to a regular room in addition to having its own door to the hallway.

The Murphy itself was more comfortable than a typical sofabed. It was a double.

Only reason I can think of why there aren't more of them is that it's probably more difficult construction-wise and it's cheaper to just put in sofabeds. While sofabeds almost universally suck, nobody notices that until it's 10PM and you're trying to fall asleep in one.