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The main reason why air mattresses are so comfortable is that they don't use coils to support the sleeper. The air mattress uses air pressure, so the support is uniform across the sleep surface. Many people find it harder to sleep on an uneven surface caused by coiled springs, because they keep shifting positions trying to find a balance between their pressure area—shoulders, hips, elbows, etc.--and the pressure points caused by the mattress. An air mattress bed needs only to be adjusted for firmness, which is distributed evenly across the bed and through the night.