Coughing is a natural reflux action of our body to clear your throat from mucus and irritation such as dust much same as yawning or sneezing. It can be caused by various factors such as common culprits like bacterial and viral infection like cold and flu, allergies, heartburn, pet dander and runny nose. There is nothing grave about it but if it goes beyond few weeks then you need to consult and doctor as it can go from normal stage to chronic stage. Some cough can go after 2-3 week without any medication. It can be irritating as cough won’t allow you to sleep peacefully at night as in night time it becomes worse. It happens due to more congestion as we lying down. Hence at night see to it that when we sleep at night we should raise our head up so there won’t be any congestion and you can sleep peacefully.