One of her best loved verses, this song of Rossetti's is from the speaker to a beloved one.  It may come across as simple but it isn't as straightforward. Rossetti implies how there is an afterlife and once gone is not gone forever, even though the speaker maybe forgotten post his/her death. It is implied that though both parties may forget each other after the demise, the soul of the speaker always lives and dreams in the twilight. Recorded with love for my beloved departed ones.