I recall reading a book maybe 20 years ago; two people on the moon went to a low budget overnight accommodation. The beds are stone shelves.
One says to the other something like
in the moons low gravity a flat stone bed feels softer than the softest feather bed on Earth
in the morning the other agrees with the first.
I think it might have been a Heinlein, work but not sure. Looking for the name of the work and the quote.