I've been there. My cough was bad, and it seemed to be more in the evening. I tested positive for the bacteria that causes whooping cough and was treated as such. I still gave a cough, but on a smaller scale. I have a cough med when I need it. Still not a good cough, but better. Goid luck.

Asthma plus allergies/sensitivities. The asthma makes him sensitive, and then any little thing provides the irritation for the mucus response to cough and eliminate the irritation. A genuine allergy will be whenever exposure happens, while a sensitivity can be more seasonal or also an exposure issue, but many things can become a sensitivity. Focusing on the asthma relief may be the best start, and then you have a chance to calm the sensitivity situation to an already overloaded system. My brothers went through this and didn't have it licked until early adulthood. I understand there are not only more, but better treatments for this sort of situation now a days. That barking cough can be worrisome! Mom was always scared of things turning into bronchitis! Perhaps a doctor check-up for it would provide a solution?

A nighttime only cough could be GERD. Ask a doctor to test for it. While he would seem young to have it, the fixes are pretty easy and it’s common enough not to rule it out without consideration

Thank you. He's currently seeing a pulmonologist they want to see if he's allergic to foods, his cough only gets bad at night.