Hidden Bacteria and Mold in Your Pillows May Be Making You Sick

Turns out your pillows may be filthy and filled with things you may not want to be exposed to.
2:33 | 11/03/14

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Transcript for Hidden Bacteria and Mold in Your Pillows May Be Making You Sick
There is nothing sexy about this pillow talk. ABC's Mara schiavocampo tells us why you may want to invest in some new ones soon. Reporter: Most of us don't lose much sleep over where we rest our heads. But your aging pillow could be home to uninvited guests. Like bacteria. Fungus. Mold, even microscopic dust mites. They can cause serious allergies. Sweat and other matter gets into the pillows and it creates a space for them to survive and grow. Reporter: What's lurking in your pillow? "Gma" investigates making house kals in one unsuspecting new Jersey neighborhood. Can we talk to you about your pillow? To collect pillows for testing. Can we have this? Oh. To see just how filthy they can get. My son has pillows I don't want to know what's in them. Reporter: In all, eight pillows. Look and smelling worse than others. It's falling apart. Reporter: We're teaming up with Charles Gerba to test the pill Lowe's. I was surprised with some of them. Reporter: The third dirtiest pillow belong thod this guy. According to Gerba, it's about as bad as the average unwashed counter top. We shared the news with him and his mom. Does it surprise you in a house this clean that the pillows still get dirty? Yes, yes. But I think because he sweats during the night. This is my spare pillow. Reporter: Hearse was a spare. The second dirtiest. The only one with traces of mold. Gerba believes a mois closet is to blame. Reporter: In another home, one with coliform bacteria. The dirtiest of them all had 65 times more bacteria. As bad as a dirty kitchen sink. How can you rest easy? Some experts recommend replacing your pillow roughly every two years. There's a tendency of people to find a pillow they like and keep using it forever until it falls apart. Reporter: For "Good morning America," Mara shchiavocamposchiavocampo. Thank you, Mara, we think.

This transcript has been automatically generated and may not be 100% accurate.

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