1. You wake with back pain in the morning. This is the number 1 sign your mattress is no longer supporting your back to allow proper spinal alignment.
2. You have trouble falling a sleep at night. If it takes you a while to fall a sleep at night it’s more than likely a comfort issue. A comfortable mattress will help you fall a sleep quickly, which mean you will get more sleep by falling a sleep quickly.
3. You wake in the night with numbness or tingling in your arms or legs. This sign is telling you your mattress is too firm/hard! Don’t confuse firmness with support. You can get the proper support without your mattress being too firm or hard.
4. You roll into the center of the mattress! This is a very common sign that you mattress is worn out. It’s also is a sign you may not have the proper bed frame. All queen size sets need a bed frame with a center support.
5. Your mattress is over 10 years old. The useful life of mattress today are 8 to 10 years. Not to mention 8 to 10 years of dust mites and their dropping building up in your old mattress. We as humans sweat every night and guess where that goes, right into the mattress. These a both good reasons to buy a very good mattress pad and have your mattress cleaned twice a year.
Great Night's Sleep Mattress Blog 