Lyric discussion by TJD 

Cover art for Sleepless lyrics by Decemberists, The

"A sorrow so" should be "And sorrow sows." This builds the "field of tears" metaphor: seeds of sorrow return a harvest of tears.

I heard "pea green sea" as "peat green sea," but I'm not too sure.

"Eyelids fix" sounds closer to "eyelids affix."

"All laid" is "all allayed."

My Interpretation