Sleeper hits, sci-fi sculpture and Martin Parr on Martin Parr – the week in art

Artists explore insomnia and snoozing, sculptors imagine alternative futures and we look back with a great British photographer – all in your weekly dispatchTo Improvise a Mountain
Painter Lynette Yiadom-Boakye portrays fictional people in made-up settings. Where does she get her haunting ideas? Here she reveals her inspirations from Walter Sickert to Bas Jan Ader.• MK Gallery, Milton Keynes, until 25 January Continue reading...