Epinephrine, of course, is related to adrenaline. This is one of the reasons that Sudafed/ephedra can leave you with all those lovely meth-like side effects.
Well, it turns out that it works the other way around, too.
After trying to cope with a difficult situation on Tuesday evening I found it nearly impossible to sleep due to the adrenaline reaction.
On the other hand, my sinuses were much clearer!
Just another random example of the miracle of human physiology...