Thanks everyone, I probably do just need to wait it out. We don't have a furnace, all baseboard heaters here. All he eats for solids is straight sweet potato, squash, chicken, beef, and pear (all puree...) and he nibbles on organic rice cakes, ingredients: Brown Rice and Sea Salt. We have no pets either.
We do have a warm mist humidifier, I was thinking last night perhaps I should hook it up. He was really congested throughout the night. Wasn't sure if it was seasonal or not. I get mild seasonal allergies in the spring, but feel good now.