Empty Days & Sleepless Nights is the second studio album by the American melodic hardcore band Defeater. The album was released on March 8, 2011 through Bridge Nine Records. It was recorded at guitarist Jay Maas' Getaway Recording Studios in Wakefield, Massachusetts. Though bassist Mike Poulin was a member of the band at the time, bass on the record was contributed by former guitarist Gus Pesce and Jay Maas. The album is split into two parts; the first, Empty Days, showcases the band's usual hardcore style, while the second, Sleepless Nights consists of 4 acoustic tracks. Like Defeater's other records, it is a concept album, following the story of a different character from the plot outline first presented in Travels.