The superficial: temporal artery travels near the zygomatic arch, the prominent part of the facial bones in your upper cheek. Because of being near a firm structure, it is easier to see/feel. I doubt that lying down is actually making your heart beat faster, but the rapid rate is more observable. Stress/anxiety could be causing rapid beating, but it dserves a good eval with your doctor. Doubt it is your spine.
Answered 5/3/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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