Countryfile explores life after dark on the North York Moors, one of the UK’s Dark Sky Reserves. At the Dark Skies Festival, Margherita Taylor finds out how light pollution is affecting nocturnal wildlife, while Sammi Kinghorn meets the people gathering vital dark-sky data and installing wildlife-friendly lighting to help protect the night. And as dawn breaks, Adam Henson is at a cattle mart meeting apprentices already used to starting work long before the sun comes up.