Nocturnal means that symptoms occur at night, and dyspnea is the medical term for breathing difficulties. PND is a feeling of suffocation when you’re not engaging in any strenuous activity ...

Paroxysmal nocturnal dyspnea (PND) are episodes of shortness of breath that occur during sleep. They can happen any time of day or night and may be a sign of an underlying medical condition.

If a person shows signs of heart failure, they should seek emergency medical care. PND may indicate that a person is living with advanced heart failure. If a person experiences PND and their ...