A blocked nose with cough that gets worse at night and sometimes causes vomiting usually happens when mucus keeps collecting in the throat or when coughing becomes too forceful. This is often seen in common viral infections, allergies, or irritation from dust and pollution. When you lie down, the mucus can trickle backwards and trigger repeated coughing, and in some people, that strong coughing reflex can even lead to vomiting or nausea. Acid reflux at night can also add to the problem in certain cases, making the throat more sensitive. Keeping the head slightly raised while sleeping can reduce this drip and make breathing easier. Warm fluids like water or mild soups may soothe the throat, and steam inhalation can help loosen congestion. Try to avoid cold air, smoke, and heavy meals close to bedtime, as these can worsen symptoms. If vomiting keeps happening, breathing feels tight, fever stays high, or the cough continues for many days without improvement, it's important to get checked properly.