If you are 31 weeks pregnant and experiencing a cough that is keeping you up at night, there are a few things you can try to alleviate your symptoms. First, consider using a saline nasal solution to help reduce nasal secretions that can contribute to coughing. Drinking plenty of fluids, both cold and hot, can also help soothe your throat. Additionally, honey has been known to provide relief for coughs. Over-the-counter lozenges like Halls or Fisherman's Friend can also help ease irritation. If your cough persists for more than two weeks or worsens, it is a good idea to consult a doctor for further guidance.