The invention is a mattress insert comprising supporting blocks (10, 12, 14) made of a foam material and arranged on a base body, said supporting blocks (10, 12, 14) are formed integrally with the base body, and said supporting blocks (10, 12, 14) comprise first supporting blocks (10) arranged with spacings from one another, and second supporting blocks (12, 14) arranged in the spacings, wherein a height of the second supporting blocks (12, 14) relative to the base body is lower than that of the first supporting blocks (10).