Halley's Comet is a song by Billie Eilish that explores themes of love, vulnerability, and the struggles of romantic relationships. The song depicts the narrator's conflicting emotions toward a person they are attracted to but also hesitant to fully commit to. The lyrics suggest that the narrator is resistant to wanting this person and is possibly trying to push them away. However, in their dreams, they become more honest with themselves and admit to having feelings for them. The mention of Halley's Comet symbolizes how rare and infrequent these feelings are for the narrator. The song also highlights the narrator's struggles with insomnia, specifically mentioning that midnight for them is 3 AM for the person they are in love with. This implies a physical distance between them and the difficulties they face trying to sleep without the comfort of the person they desire. The lyrics further reveal that the narrator is usually good at being emotionally detached and feeling nothing, but their feelings for this person have made them feel vulnerable and hopeless. They acknowledge the irony of falling in love when they initially didn't want to. The narrator then reflects on their past experiences with love and concludes that they have never felt this strongly for anyone before. They feel a deep connection with this person and believe that they were meant to be together. The song ends with the narrator expressing their confusion and uncertainty about their feelings. They find themselves in their brother's room, unable to sleep and contemplating if they have indeed fallen in love. They seek guidance and ask for help in navigating their emotions. Overall, "Halley's Comet" explores the complexities of love, the internal struggle between wanting and resisting someone, and the emotional turmoil that can come with it.