is bed sag really this common?

Hi SleepDeprived,

There are many different types of latex mattress designs (or latex hybrid designs) and different types and blends (or combinations) of latex or other components that can feel and respond very differently from each other so sometimes it can just be a matter of finding the “right” latex mattress that is a good “match” in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) and how it feels compared to other latex mattresses.

There is more about the different types and blends of latex in post #6 here and there is also more about some of the differences between Dunlop and Talalay in post #7 here.

Phoenix