👉 The nasopharynx is a small, thin tube located at the back of your throat, just below the roof of your mouth. It helps to filter out allergens and other irritants that enter your airway during your sleep. Nasopharynx also plays an important role in regulating body temperature by helping to keep you cool when you're not actively sweating. The fluid in your nasal cavity helps to cool your blood, which is essential for maintaining healthy blood pressure and nerve function. The