Bunkie board full's advice is to add mattresses to help with sleep. What gives free, more advantageous and fragile help? Most are under the walkway to sleep with any spring, box or structure. Regularly adjust the leaves to help floor foam because these are denser and heavier compared to the inner spring or the wind bed.
I have summarized things for you. These costs are very friendly and helpful for sleeping. You should not emphasize with the material here: wood, hardwood and steel plates, ribbon cushions and other basic things to carry out the cooling.