

Breathing difficulty while lying down is an abnormal condition. A person with this condition must keep the head elevated (by sitting or standing) to be able to breathe deeply or comfortably. The condition may also cause a person to wake up suddenly during the night, feeling short of breath (paroxysmal nocturnal dyspnea).
Waking at night short of breath; Paroxysmal nocturnal dyspnea; PND; Difficulty breathing while lying down; Orthopnea