Two things... either his mucus is thick or there is none and its just swollen. If you put a couple saline drops up there then suction out that should do the trick if theres anything to get.
As far as sleeping... there are lots of things to try but I would wait until hes not sick anymore. In the mean time:
suction out nose often
keep head of bed propped
use a humidifier
also enclose him in a steamy bathroom with you
Id take him to the doctor
Quoting CrimsonGrace:Try Little noses saline, it is non medicated.
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