The journal of chiropractic medicine published a study that compared sleep quality, back discomfort, and stress improvement after switching to a new mattress set [1]. The study recorded 30 women and 29 men's sleep for 1 month on a worn out mattress (~9.5 years old, moderately priced) and 1 month on a new medium-firm mattress.  Significant improvements were found in sleep quality and efficiency by simply replacing the mattress. Furthermore, continued improvement was measured in the next month following the mattress change, and stress/worry markers were significantly decreased. Another follow up study specifically focusing on patients (n=27) with complaints of low back pain and stiffness recorded symptom improvements over a 12 week period post mattress change [2]. The replacement mattresses had a comfort level of medium-firm and latex/foam layers were tailored to accommodate the dominant sleeping position of the patient. Sleeping on the new, tailored mattresses resulted in a significant improvement in patients' back pain, back stiffness, shoulder pain, sleep quality, and sleep comfort. Furthermore, the improvement in back pain and stiffness continued to get progressively better throughout the 12 weeks studied. 

So, you didn't just hear it from us, a new mattress really does mean better sleep.

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[1] Jacobson, Bert H., Ali Boolani, and Doug B. Smith. "Changes in back pain, sleep quality, and perceived stress after introduction of new bedding systems." Journal of chiropractic medicine 8.1 (2009): 1-8.

[2] Jacobson, Bert H., et al. "Effect of prescribed sleep surfaces on back pain and sleep quality in patients diagnosed with low back and shoulder pain." Applied ergonomics 42.1 (2010): 91-97.