Indigo8
I once bought a very expensive orthopaedic mattress as I have back problems. I spent a very tedious afternoon in a specialist shop talking to a specialist sales person before deciding on which mattress to buy.
After my first night on it I felt as though I had slept in the middle of the road and not only my back ached, I had aches where I had never had them before.
I ended up using a thick duvet as a mattress topper and buying extra deep fitted sheets. It sort of worked but was not ideal.
Osteopaths usually say that it's a good idea to have an Orthopaedic mattress, before and as long as you don't have any problems with your back or pain in your spine. If that's the case, they are simply too hard and you won't be comfortable enough to have a decent night's sleep.
I've experienced a 'slept in the road' feeling in a couple of hotels and it's awful. Comments here show that you can put right the problem with your mattress by having a good quality topper and you don't need to wake up feeling like Quasimodo. Duvets are only good for emergency topping, I've found.