You would be surprised to find out how interesting it is to read a long discussion [1] on the physics of the ideal bed. And how hard the physics is considering

You would be surprised to find out how interesting it is to read a long discussion [1] on the physics of the ideal bed. And how hard the physics is considering how obvious the answer seems at first. Essentially distribution of force and responsiveness in ability to mold to give a minimum amount of pressure per area of skin is what is key. A perfectly molded extremely hard surface would be very comfortable while you remained perfectly still. Soft tends to be better because it responds to changes in position more readily. But too soft doesn't actually allow a proper distribution of force so hard but yielding is ideal. Hard also resists movements less and since changing positions is another way the body counters excessive pressure, it is ideal for people who utilize this feature. For those who move more this is a better compromise. What is the best bed packs a lot of physical punch, it will lead you all the way from biology to quantum mechanics if you so chose. [1] http://www.scottaaronson.com/blog/?p=464 http://www.scottaaronson.com/blog/?p=464