Try taking a hot steamy shower which helps to put moisture into your lungs and helps to stop coughing.
Use a humidifier or vaporizer in your house or bedroom at night to help add moisture to the air which is helpful for coughs.
Also be sure to stay hydrated as much as possible.
Get an air purifier as well which will remove irritants from the air which could be making you cough.
Try taking some Halls menthol cough drops which help to clear up coughs quickly.
Halls cough drops work great for me when I have a cough that won't go away.