Just because you can keep your mattress forever, doesn't mean you should.

Over the years, your mattress practically doubles in weight from sweat, dead skin and millions of dust mites. That doesn’t just sound unhealthy- it is unhealthy - especially if you have allergies or asthma. To find out how old your mattress is, check the tag. If it’s over 8, it’s time to replace. Let Mattress Firm’s professional Sleep Consultants help you find the right mattress for a great and healthy night’s sleep, tonight.
"Signs you may need a new mattress - you wake up with stiffness, numbness, aches and pains, you had a better night's sleep somewhere other than your own bed (such as a hotel), your mattress shows visible signs of overuse (it sags, has lumps, the interior is exposed, etc.), or your mattress is seven years old or older*" ... read more
“...The mattress and the pillows actually become reservoirs of human cells, dust mites, bacteria, fungal spores, fungal elements pollen, dander, and secretions and excretions of the body that accumulate over 10 years.” ... read more
Mayo Clinic
"Dust mite allergy is an allergic reaction to tiny bugs that commonly live in house dust. Signs of dust mite allergy include those common to hay fever, such as sneezing and runny nose. Many people with dust mite allergy also experiencing signs of asthma, such as wheezing and difficulty breathing." ... read more
"As many as 2 million mites have been counted in unprotected mattresses and it only takes 4 months for an unprotected mattress to become infested." ... read more
References / Sources: 
  • Mayoclinic.com
  • Protect-A-Bed
  • Better Sleep Council
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