An old English proverb says: "Sleep is better than medicine”. And this is true, but only if you sleep correctly. You can sleep the right way if your mattress is perfectly in harmony with your weight, your build and your sleeping customs. Your biomechanics is correct when your backbone is well situated – regardless whether you are lying on your back, in a side position or in a face-down position. If, for instance, the degree of hardness is not right, disturbances in blood circulation ...