Orthopnoea

Name(s): 
Waking at night short of breath
Paroxysmal nocturnal dyspnea
PND
Difficulty breathing lying down
Nature 
Orthopnoea (also orthopnea) is an abnormal condition in which a person must keep the head elevated (sit or stand) to breathe deeply or comfortably.
Broader 
Type 
(G) Very specific problems