My 3yrs old daughter is coughing frequently. usually coughs starts in the evening and continues till she sleeps and she will be normal in the morning again. when we consulted the doctor, after checking all reports, he said she is having dust allergy and provided medicines. we consulted another doctor, he also said she is normal. 1 Yr passed, she still having cough issue on the evening. it is very uncomfortable for her. Any suggestions from anyone, what we can do?