I by Day, You by Night (German: Ich bei Tag und du bei Nacht) is a 1932 German musical comedy film directed by Ludwig Berger and starring Käthe von Nagy and Willy Fritsch. It was shot at the Babelsberg Studios and on location at the Sanssouci Palace in Potsdam. The film's sets were designed by the art director Otto Hunte. It premiered in Berlin on 29 November 1932.