Another natural method that may help you find relief from environmental factors behind your post-nasal drip is by inhaling ...

A nasal rinse is a common practice to clear nasal passages, especially during cold, flu, and allergy seasons. It helps remove mucus, debris, and allergens that build in the nose. “A saltwater rinse is ...

They also help rinse out allergens, dust, and thick mucus from the sinuses, Reddy says. "This cleaning action allows the sinus passages to open up, reducing pressure and easing sinus headache pain." ...

You may also want to use a neti pot to rinse your sinuses ... your head up may keep your sinuses more open. Consider trying a wedge pillow to make this sleep position more comfortable.