Hi Dorrie,
I sure understand about not being able to sleep with the phlegm problem.
I find that vitamin A taken before I go to sleep reduces how much I have.
In terms of infection, I keep infections at bay by using vitamin C in rather large doses, which is fine as long as you don't have diabetes and a certain gene. But, curiously, if I take a lot of vitamin C when I don't really need it I get phlegm from taking it. I find that astonishing.