Re: Sinus & Blocked Nose - Unable to breathe @ night!
Maybe its not the sinus.
Allergies like Asthma usually get worse at night and early mornings.
Sinus problems happen during the day in summer when there are more chances of hayfever/pollen etc.
If vicks and steam isnt helping then you should get him tested for Asthma or maybe think of what you have changed in your bedroom like sheets/pillows etc which might be causing him the agony