Why my dad didn't like me cough at night?

I still remember when I was around 10 or 11 years of age, my dad used to get tensed and even scold me when I cough at night. "What happened? Drink water!" I used to wonder how could anyone control cough and would not talk back anyway. I would close my mouth tight or hold it inside to the extent possible and it came out after a few seconds though!

Now why am I reminded of this all of a sudden? Last week, Isha had cold and cough. Every time, she coughs or rolls or makes some uncomfortable movement, it wakes me up. I literally don't go to sleep if she has any little inconvenience.

Now I understand why my dad was not happy when I coughed. It bothered him so much he vented it out on me. I love you dad :)