At this level, the carotid sinus is susceptible to variations in arterial blood pressure. It is the primary human baroreception site.
 

The carotid sinus, which is made up of baroreceptors that track blood pressure, is the carotid artery's reflex area.

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Numerous baroreceptors in the carotid sinus serve as a "sampling area" for a variety of homeostatic blood pressure-maintenance processes. 
Putting too much pressure on the neck from an improper pillow might irritate the carotid sinus, a blood pressure sensor, and result in abnormal blood pressure. Encourage the neck's natural C-curve to enhance blood flow.
 

According to this anatomical foundation, a number of blood pressure symptoms can be avoided and improved by utilizing the Cure Pillow to support the neck's natural C-curvature while you sleep.