Orthopnea: A serious cause would be incipient congestive heart failure. This is an early sign of a weakening heart muscle as the heart works harder when lying down compared to sitting up. Another possibility is simply focussing on your respirations which is an involuntary reflex. However focussing on your breathing can give one the sensation of shortness of breath. I recommend seeing your MD for assurance.
Answered 3/3/2020
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