foul smelling mucous when sneezing

[J Grymm]

First thing in the morning it seems to be daily I sneeze about four of five times and when I blow my nose the mucous is clear and it fills the room with this foul medicincy stench that could make you not want breakfast

[National Jewish]

This may or may not be allergy, but relates to mucus that builds up during the night.  This is common in a non allergic condition called vasomotor rhinitis.  If it is a problem, taking medication at night might help. I would speak with your physician about the many medication options.