Sleeping on one’s stomach may be about as common as it is maligned: According to a nationwide survey by The Better Sleep Council , 17% of respondents prefer lying on their stomachs to fall asleep. Yet 26% of respondents deemed it the “worst” sleeping position of all. Popular misperception of stomach sleeping may help explain why targeted products for face-down sleepers can sometimes feel so scarce, overshadowed by offerings for side and back sleepers — despite the position’s relative popularity. For example, the archetypical commercial pillow is thick and fluffy, mirroring the kind of cloud-like cushion depicted in storybooks. Yet this is simply not the kind of pillow stomach sleepers should be using. “The best pillow for stomach sleeping should be soft and fairly thin to maintain proper spinal alignment ... You want to avoid a pillow that is too thick and causes strain,” explained Dr. Fariha Abbasi-Feinberg .…