What is the meaning of awake by secondhand serenade about?

The song is a nostalgic recollection of a passionate past romance. The song takes the listener through a series of vivid images of the couple’s relationship, capturing both the beauty and the pain of the experience. The lyrics suggest a sense of longing and regret for the lost love. The repeated phrase “I lie awake" throughout the song serves as a reminder of the protagonist's inability to move on and forget about the past.