Hi Dear, Welcome to Health Care Magic Team. Understanding your concern about cough. Often a cough that is worse when you are lying down is caused by acid reflux, or acid from the stomach backing up into your throat. Other reasons for a cough that worsens while lying down may be the post-nasal drip from a cold, or bronchitis or asthma. Coughing while lying down is sometimes the only symptom of a bronchial obstruction. If you have frequent bouts of bronchitis, your doctor may consider a diagnosis of asthma. Medications may be prescribed to reduce symptoms related to heartburn. Antibiotics are often prescribed to treat bronchitis, though, they have not been found effective in reducing symptoms. Symptoms caused by asthma may be improved with an inhaled medication. If your cough is caused by acid reflux, avoid highly acidic foods that aggravate your heartburn, particularly before bedtime. If you smoke, stop, since tobacco can also make your condition worse. You can also try using extra pillows to prop your head higher, or put a pillow or blanket under your mattress to elevate your head. Wash your hands frequently to minimize the risk of catching a cold or other viral Hope your concern has been resolved. Best Wishes, Dr. Harry Maheshwari