You can choose a traditional spring mattress, a memory foam mattress or a hybrid design. If you are a side sleeper, the best mattress for you will probably have a little more springiness than the ideal mattress for back or stomach sleepers.
What sort of bed frame will you be using with your mattress? Some bed frame designs include a box spring that must go beneath the mattress, and some designs support the mattress directly on a platform. A box spring can help vent air into the bottom of the mattress and allow moisture out. It will also raise the height of the mattress, which can make it easier to get in and out of bed.
The height of your nightstands, for instance, will depend on the height of the bed. Obviously, your bed size and mattress size will need to be the same size, and you’ll also want to match your bed choice to the rest of your bedroom furniture.