We Aussies are used to soft mattresses - probably why many of us have "bad backs" - but that is the way it is. When one first tries a bed in China - well, it is like sleeping on a rock. It seems the harder the bed the better - in fact soft mattresses are less expensive, and if you go to someone's house to stay, they will apologise if the bed is not hard enough.
It is good for "making" the bed - the bottom sheet never seems to move, so there's little smoothing out of wrinkles in the bed. If you catch a train - for example from Shanghai to Beijing, you have a choice of beds - soft beds or hard beds. And guess what! The soft beds are the less expensive ones!
Way to go!!!