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A study by Krystal and Edinger overcame the shortcomings of previous studies by examining a large number of people (128), a large variety of different firmness of mattresses (seven), and a large number of nights on each mattress (four weeks). After evaluating more than 16,000 nights of sleep it was clear that even small differences in mattress support (soft, medium, firm) correlated with changes in sleep and pain. This is a clear indication that mattresses really do matter. However, the study had a second powerful conclusion: We may not be able to determine which mattresses are best for us when we are awake, and the ways to increase productivity.
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