Hans film is the third part in a trilogy where Haugerud portrays the complexity of sexuality and social norms. In "Drømmer", it is 17-year-old Johanne (Ella Øverbye) and her first fumbling infatuation with her teacher that takes center stage.
According to NRK, it is the first time a Norwegian film wins the Golden Bear.
The acting awards in Berlin are gender-neutral and the best actor award went to Rose Byrne for her role as a crisis-stricken young mother in "If I had legs I'd kick you".
Irishman Andrew Scott received the award for best supporting actor as composer Richard Rodgers in Richard Linklater's "Blue moon".
The Golden Bear jury at the 75th film festival in Berlin was led by American director Todd Haynes. No Swedish films competed this year, but the festival highlights ten young actors from around Europe who are predicted to have brilliant careers, and this year Swedish Frida Gustavsson was one of these "shooting stars".
Previously, among others, Asta Kamma August, Gizem Erdogan, Evin Ahmad, and Gustav Lindh have been named "shooting stars" in Berlin.
The Berlin Film Festival is ranked alongside the film festivals in Cannes and Venice as Europe's three most important.
The Golden Bear for best film: "Drømmer" ("Dreams (Sex love)") by Dag Johan Haugerud.
The Silver Bear (jury's grand prize): "The blue trail" by Gabriel Mascaro.
The Silver Bear (jury's prize): "The message" by Iván Fund.
The Silver Bear for best direction: Huo Meng for "Living the land".
The Silver Bear for best actor: Rose Byrne in "If I had legs I'd kick you".
The Silver Bear for best supporting actor: Andrew Scott in "Blue moon".
The Silver Bear for best screenplay: Radu Jude for "Kontinental '25".
The Golden Bear for best short film: "Lloyd Wong, Unfinished" by Lesley Loksi Chan.