My son has had a chronic cough on and off for years, now it's been on for 5 months. When his cough is at its peak, he'll start coughing immediately up waking up. But most of the time it starts about 10 - 30 minutes after he wakes up, and I'm wondering why that would be. I'm trying to figure out whether it's due to asthma, allergies (all his allergy tests came back negative) or what. It just seems weird that it doesn't start right away. He coughs a lot in the morning, and then periodically throughout the day. Only very occasional night time coughs. I was curious, at what time of day your kids cough is the worst and if anyone know's why people cough at some times of the day/night and not others. Thanks everyone.