The depth and complexity of the music lies not within the melody nor progression, but of the voicing. While you can try to remember the melody and hum the overall tune, you will find yourself having a much more difficult time humming the voicing of the chords. Like just in a dream, the main idea is memorable, but certain details remains elusive, and can only be triggered by re-visiting the experience again.
These were my thoughts as I was writing the song. I was also heavily influenced by the snow. It is freezing out here in the midwest, but while looking out from the window, the snow is actually very peaceful and nostalgic – just in a dream.