This is a question that is more about personal preference, experts say, but what most studies agree on is that the pillow should be high enough and low enough that the head and neck are comfortable. fully supported and comfortable in the chosen sleeping position.
A person who sleeps upside down needs a very low, almost completely flat pillow. Although it does not provide much support for the head and neck, this type of position allows the back and spine to be closer to ideal alignment.
While people who sleep on their backs and on one side need higher pillows because they provide support for the head and neck in such positions.
Derek Hales, founder of Sleepopolis-Mattress-Reviews.com, points out that the key to the ideal height is finding the unique position for your back, body, head and neck.
The following images help you, but keep in mind: neck and back in a straight line.
