Insomniac is the fourth studio album by American rock band Green Day, released on October 10, 1995 by Reprise Records. It was recorded at Hyde Street in San Francisco, and the band prioritized high-energy takes during the recording sessions. Released as the follow-up to the band's multi-platinum breakthrough "Dookie", "Insomniac" featured a heavier and more “punk” sound, and bleaker lyrics than its predecessor. Lyrically, the album discusses themes such as alienation, anxiety, boredom, and drug use. "Insomniac" also served as a reaction to many early fans who had turned their backs on the band after it achieved mainstream success with "Dookie".