What time of day it manifests itself more in the cough and why

According to experts, each condition manifests itself at different times in the day, depending on the biological rhythms of the…
our body and hormone levels.
For example, the hours of high risk for the heart and brain are usually in the morning, then they happen the more heart attacks and strokes. What applies to the μππούκωμα and cough?
According to a study at the University of Quebec, Canada, from 4 in the afternoon and then starting to intensify the symptoms of colds and other viral diseases of the respiratory tract – perhaps because it is less active hormones that play a role in fighting infections.