Cough And Wheeze All Night, Party Every Day

I need some smart doctor-types out there to answer one simple question: Why is it that whenever I have a nasty cough, it only seems to manifest itself as the sun goes down? The cough just gets worse and worse as bedtime gets nearer and nearer.

In other words, why is my own body forsaking itself by preventing a restful night's sleep? What do I have against myself?

How do my lungs know to begin convulsing by the time I'm on my way home from work? Is my cough affected by the moon's gravitational force? Are there evil spirits nesting in my chest? What should I eat for lunch tomorrow?

The questions go on and on.

So I guess there's more than one question I'd like to have answered.

If you're a doctor, you play one on TV, or you're just a layman with a penchant for medical text books, please let me know why I cough much more at night than I do during the day.