Well that is a very interesting question, Arky, what side of the bed do I sleep on? That is in itself an enigma so I will have to explain it. Everyone knows that there are many sizes of beds so I will just take the average size "average" is only fit for one person so I am guessing the length 6 ft and width would be about 4-5 ft. You of all people know that we must use the "pillow effect" thus rendering the springiness a part of the mattress a measuring factor. The springiness of my bed is average so we have to you use Dunham's Equation [50%+4.5 feet/6 ft] which makes the answer...