We bought a California king mattress (serta sleeper) from sleepy's 3 years ago. About a year ago we noticed that the bed started to sink down (in different spots). I finally went to sleepy's told them what happened to the mattress. They sent out an independent contractor to take pictures of the mattress, box spring. When the guy was taking pictures he said that the mattress has to at least sink down 1 1/2 inches and ours sinks down 2 1/2 inches. He also stated that in suffolk county alone he visits about 40 homes a week with the... read full review »