Sleep is a state of rest. You will have to be in a complete state of rest, well relaxed and comfortable so as to really sleep.In the sense that after you wake up, you should feel refreshed and revitalized.That is when the sleep you had actually makes sense. A memory foam mattress is a good solution for your sleep. You know why it is called Memory foam?? It changes its shape when you sleep on it to give you maximum comfort.However, when you wake up it comes back to its original shape and thus the name.