Reasons for congestion
polyps have grown in the nasal passages
the tissue attached to the turbinate bones in the nasal passages is swollen (they have erectile cells which react to emotions)
If you have chronic breathing problems at night:
Place 1 teaspoon salt in a glass of water and sniff in through the nose to clean out the sinuses.
Rub a drop of cold-pressed sesame oil into the nasal passages with your finger.