I drink around a glass of water and goes to sleep around around 10.30 to 110m. Suddenly between at  3 to 4pm i am having some dry cough for 2 to 3 mins. Then i will wake up and sit down. Then drink some water. Later after 2 to 3min i am feeling normal again. For the past 10 days almost for every day this kind of problem seen. In the day time atleast till going to bed this kind of dry cough not much. I am worried a lot what could be really going wrong. Could you please help me to provide your suggestion and treatment to come out of this problem?