I think this song is about the singer having a dream about his ex. In his dream, he sees her and everything is so beautiful and when he wakes up, he wishes he could dream about her forever. He lies awake in his bed yearning for her and it pains him to know that she's not with him anymore. He thinks about her and is nostalgic of the past. He realizes that he may never dream of her or see her again and he's been 'awakening' all along, which probably means he will move on gradually.
I think this song is about the singer having a dream about his ex. In his dream, he sees her and everything is so beautiful and when he wakes up, he wishes he could dream about her forever. He lies awake in his bed yearning for her and it pains him to know that she's not with him anymore. He thinks about her and is nostalgic of the past. He realizes that he may never dream of her or see her again and he's been 'awakening' all along, which probably means he will move on gradually.