"Duvet" is a song by the British alternative rock band Bôa. It first appeared on their 1998 album The Race of a Thousand Camels. It was also featured on their 2001 record, Twilight. The song originally became popular after being used as the opening theme to the anime series Serial Experiments Lain. The song later gained popularity on TikTok, which resulted in Bôa reforming after an 18-year hiatus. The single was certified platinum by the Recording Industry Association of America (RIAA) on October 16, 2024, for selling over 1,000,000 copies in the United States.