Mattresses tend to lose firmness over time due to heavy usage. Apart from its core materials losing strength, the mattress also absorbs moisture which doubles up its weight.
This results in the stretching out the mattress cells, causing them to lack proper hold.
Temperature changes also cause a mattress’s firmness to fluctuate. According to science, matter expands when heated and contracts when cooled. The same goes for mattresses. If you live in an incredibly warm area, your mattress might feel less firm. This can be resolved as you will find out later on in this article.
Insufficient care and improper positioning are other factors that cause mattresses to lose their firmness.
Sometimes, however, it could be that you just bought an overly soft mattress. In such instances try returning it first. Most mattress companies today have an incredibly gracious trial period.