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During the Neolithic period, mattresses are invented. These beds are raised off the ground to avoid pests and dirt. These mattresses are made of all natural items (a truly organic mattress), such as leaves, straw, or grass covered in animal skin. Certainly beats your favorite rock!
Mattresses continue to evolve in Persia where we find the first water bed. These are made of goatskin and filled with water, surely a very comfortable sleep. These mattresses were not for the common man; rather, it is thought that they were created either for royalty or for the elderly.
Thousands of years later, the mattress evolves again by the hand of the Romans. These mattresses are made of cloth and stuffed with hay and wool. The rich would stuff their mattresses with softer items like feathers.