Pros
Provides Strong Support for the Head and Neck
A firm pillow keeps the head and neck continuously supported while you sleep. For side and back sleepers, an unstable surface can cause the head to sink, leading to a significant amount of head and neck pain, especially when abnormal neck bending is sustained for prolonged periods. You can count on a firm pillow to be supportive and prevent this problem.
Maintains Proper Neck and Spinal Alignment
Strong support results in a neutral spinal alignment. By maintaining the correct alignment of the neck and the spine, you can sleep comfortably for the duration of the night with the assurance you won’t be greeted with a strained neck or a headache when you wake up the next morning. Maintaining the proper spinal alignment will also protect you from feeling back pain that can be caused when your spine is forced to curve abnormally as a response to the strained and/or bent neck problem.
Prevents Snoring
The stability of the firm pillow can keep the head raised just so, benefiting back sleepers by preventing snoring problems. This position keeps the tongue from falling back, which can also lead to the breathing passageways being blocked as you sleep.
Cons
Stiffness Can be Uncomfortable
Some sleepers find firm pillows to be uncomfortable because of the enhanced stiffness. This can be especially true for people who are used to sleeping on plush pillows. A firm pillow may also be the cause of pressure spots developing on the side of the head – especially on the ear that is pressed into the pillow’s surface – which can become quite uncomfortable even when sleeping with the pillow for only a few hours at a time.
Not Suitable for Stomach Sleepers
A firm pillow may not be the most ideal choice for stomach sleepers. This is because a rigid pillow will not allow the head to sink in closer to the mattress’ surface, which will be most comfortable for the stomach sleeping position. The firm pillow will cause the stomach sleeper’s head to become raised unnaturally high. This abnormal alignment will definitely cause pain, especially with long-term use.