BBC thriller series “Nightsleeper” is returning for a second season, multiple outlets report. The announcement comes from industry and entertainment coverage highlighting the show’s prior impact for the BBC, with one report describing the first run as the broadcaster’s biggest new drama launch of that year. Across sources, the key update is a change in the series’ setting and premise. While the first season centers on a train, Season 2 moves the story to a boat at sea, according to reporting that mentions the series “switching from train to sea.” Several outlets also reference promotional material, including a trailer, with one site specifically pointing viewers to watch it. Coverage includes broadcast information that the new run will air on BBC, but specific release dates, casting changes, and detailed plot specifics are not consistently stated in the provided excerpts. Overall, the reports agree that the BBC confirms a return for “Nightsleeper” and that the second season adopts a sea-based location for its new episodes.