Gneiss, I work nights also and have off and on for many years. I rarely get great sleep and when I'm sick it's a hundred times worse. When my sleep schedule is thrown off for any reason- or I just can't fall asleep at all which happens often-it can change my whole perspective on things going on in my life.....and not in a good way.
Drink plenty of water. I like herbal teas when I am fighting a nasty cold.
Hope everyone has a great night. Back to work for me then 3 nights off