Combination problems: Congestion after lying down is due to dilation of nasal tissues related to gravity. That said, if your septum was straight you probably wouldn't feel congested. Also, most people have at least mild allergies so when you say "no known" do you mean negative tests? It turns our there is a commin condition called "local allergic rhinitis" where the nose is allergic but tests are negative. See an ent.
Answered 9/28/2016
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