Pros
Great for Back and Stomach Sleepers
A firm mattress provides a stable, supportive surface for those who sleep on their back or stomach. . Stomach sleepers will also benefit from the prevention of a suffocating feeling that comes from sinking too deeply into the mattress structure, which may be experienced when a stomach sleeper uses a too-soft mattress.
Provides Excellent Support
Firm mattresses provide fantastic support to protect the lower back from collapsing into the depths of the bed. The excellent support from a firm mattress will greatly benefit those who suffer from back pain, especially if the issue is nerve-related.
Helps Maintain Good Spinal Alignment
When your spine is in a correctly aligned position, it will be easier for you to achieve a restful sleep experience. You won’t need to spend the better part of the night tossing and turning to find a soothing position as your body is allowed to naturally feel comfortable in the position you prefer. Good spinal alignment also encourages your lungs to bring in more oxygen, helping you achieve better blood circulation that will bring you numerous health benefits.
Even Body Weight Distribution
Firm mattresses work to keep your weight distributed equally throughout the sleeping surface. This means that as your spine is maintained with its natural curve in your favored sleeping position, the heavy parts will not be pushed down into the surface of the mattress. The firm mattress will be able to support your body while you sleep and prevent painful pressure spots that can develop when pressure-sensitive body parts – such as the hips and the outside of the ankles – are pressed too firmly into the mattress surface.
Cons
Can Be Too Stiff for Some People
A firm mattress may feel too stiff for some people, especially those who are used to sleeping on softer beds. Transitioning from a plush to a firm mattress may be challenging at first but can eventually become more comfortable as time goes by. However, a firm mattress may actually bring more discomfort and pain to some people, such as those who are sensitive to sleeping on rigid surfaces and those who have back problems including scoliosis and arthritis.
May Be Uncomfortable for Side Sleepers
Side sleepers may find it uncomfortable to sleep on a firm mattress. This is because the enhanced firmness of the surface can cause painful friction when pressure spots such as the shoulders and hips are pressed too strongly into a firm mattress.