Mites need three things to survive: food, proper conditions of humidity and safety. All three are found in our homes. Their primary food source is shed skin cells from the human inhabitants and pets or feather-stuffed bedding and furniture. Skin shedding occurs in areas where humans spend the most time when at home, so these are a good reason why the highest concentration of mites found in stuffed furniture, carpeting, mattress and bedding.
The mattress makes an ideal breeding ground for dust mites because the mattress is warm, humid and collects a high amount of human dead skin flakes that are shed every night when we sleep. Besides dust mites and dust, the mattress also contains our body fluid residue, bacteria, and other microorganisms.