The autonomic nervous system is included in the peripheral system and is largely unconscious. It controls vital body functions such as heart rate, swallowing, breathing, digestion, and arousal.
The typical incubation period for a cold is 1-3 days. This means that it takes between 24 and 72 hours from the time you are exposed to the virus until you start to experience symptoms. Of course, this doesn't mean you will get sick every time you are exposed to a cold virus.
Depends on condition: Incubation period for common cold is. 2to3 days but sometimes symptoms can start after 12 hours as it depends on the virus. Same holds true for influenza average is 2 days. Other conditions like Pneumonia etc may have different incubation period. But on average most 2 to 3 days.