I saw there were some other threads on memory foam mattresses/toppers. Well I got one recently from Costco: the novaform elite. It is a 4.0lb density 3" thick topper (not sure on the ILD). At first I was worried it might be bad for my back seeing as it has that sinking property. But honestly, it has helped my back tremendously from the very first night of sleeping on it. It's not a cure for back pain but it does help. I've researched mattresses extensively back when I got one about 10 years ago and things have changed since then. Back then, I was really looking at no-wave water beds (the ones that use finger-like compartments of water). Those were extremely comfortable and healthy for back pain, but pricy. Then I looked at foam and latex and went with a foam mattress (38ILD with 36ILD convoluted foam at both ends). It was not expensive and very comfortable. After 10 years though, the foam has started to lose its ability to conform to body shape. I've now re-researched mattresses. I am looking at either a good tallalay latex mattress or Sensus memory foam mattress. Both are priced almost equally. Before investing in a full sized mattress, I decided to try the Costco memory foam topper. And so far it has exceeded expectations. Memory foam is supposed to be really good for chronic aches/pains. And I can see why; you just feel no pressure points. I've learned a few things about memory foam though. First off, forget all the marketing hype about it being 'space-age' material developed by Nasa. This is totally false and misleading advertising. Memory foam is a bi-product developed from an idea Nasa had to use a foam to help alleviate g forces for astronauts. It never worked and that initial product was not suitable for mattresses. It was many many years later that a formula was developed to be used for mattresses. Tempurpedic developed this first mattress-friendly memory foam and they sell mattresses at very very high markups. They use high density heat sensitive visco-elastic memory foam. Now not all memory foam is heat sensitive or visco elastic. There is a difference. My memory foam topper does not say visco elastic. The reason why many people don't like Tempurpedic mattresses is because of the heat sensing property. It makes you feel sticky and as if being 'grabbed' by the foam. For those who don't like or can't get used to that type of feel, they prefer the Sensus memory foam. It is of equally high quality to Tempurpedic but a lot less expensive and does not react to body heat. Many prefer this type of memory foam. The bottom line with mattresses is that it is one of the most complicated yet important items we shop for. It is so important to get a good night sleep for anyone, but especially athletes such as us tennis players. Everyone has a different preference and you need to try out a few mattresses. Many have a 30-day trial. Memory foam needs at least 10 days of trial. Some try it for 5-6 days and return it, not knowing that they would adapt and really like mattress after about 10 days. If you go to a store, try out each mattress for about 10 mins. Some will feel comfy at first but then you'll start to notice pressure points. Costco also sells full memory foam mattresses. The great thing about costco is that they will take back any mattress if not completely satisfied. If anyone out there is feeling achy/tired in the morning, look into memory foam or latex toppers/mattresses. It is one necessary step to alleviating pain.