How to keep common cold in control?

This assumes you have this problem. Change bedding often. Citronella is a herb which sort of smells like lemon and lime. A small spray will provide a better room air freshener when the essence oil is put in a few drops into a mister sprayer.
Avoid going overboard. Places like arms of chairs and also to spray the closet of clothes shirts etc.
Turn pillow over when ever you get out of bed.
Clothes dryers and pillows do not mix. Freshening a pillow is not equal to a day off in bed because of being sick.
As air conditioning technician and air quality for several companies, things turned around and most staff were only late or off sick on fantastically nice days.
Sleep with a bedroom window giving good quality air. Please note many offered the opinions dreams were vivid and lovely.