I know what this song means. Well adam youngs gf died right before this song came out. So it is prolly fact that this song was written thinking of her. He lies awake thinking of her because she isn't there "pour me a heavy dose of atmosphere" he needs to come back to reality she isn't there but he wants to be in her arms still. He can't send her a post card but he would if she were still here. He can watch everything that is going on around him but it isn't the same without her "the spaces between my fingers are right where yours fit perfectly" he wants to hold her hand. He'll try to sleep some how because he hasnt been able to yet. If you didn't know nastalgia is to want to return in thought or in fact to a former time in one's life. Basically he misses her. When talking of "vanilla twilight" he is talking about sitting on the porch in moonlight. Thinking of his girl makes him not lonely. He is always thinking of her. He is coming back to reality and he wants to forget everything about the past but "i swear i wont forget you" He want to let her know that he misses her so he I still thinking about the past. No matter what you believe this song is about it will always be a sad story. It is a good song and I love owl city! Great music with great lyrics! People will always be listening to this and I know I will! Ily till the end! ~4real.