While the Patient Slept: Cast
Aline MacMahon
Nurse Sarah Keate
Guy Kibbee
Detective Lt. Lance O'Leary
Patricia Ellis
March Federie, Richard's Granddaughter
Hobart Cavanaugh
Eustace Federie
Dorothy Tree
Mittie Federie
Robert Barrat
Adolphe Federie
Helen Flint
Isobel Federie - Adolphe's Wife
Lyle Talbot
Ross Lonergan
Henry O'Neill
Elihu Dimuck
Walter Walker
Richard Federie
Allen Jenkins
Police Sgt. Jim Jackson
Eddie Shubert
Detective Muldoon
Russell Hicks
Dr. Jay
Brandon Hurst
Grondal - the Butler
Joseph E. Bernard
'Murph' Murphy - the Ballistics Expert (uncredited)
George Chandler
Evening Bulletin Reporter (uncredited)
Nick Copeland
Detective Davis aka Johnson (uncredited)
Joseph Crehan
Evening Bulletin Editor (uncredited)
Bill Elliott
Bank Teller (uncredited)
Virginia Howell
Kema - the Cook (uncredited)
Milton Kibbee
Evening Bulletin Archivist (uncredited)
Henry Otho
Frank - Detective (uncredited)
John J. Richardson
Reporter (uncredited)
Ferdinand Schumann-Heink
Reporter (uncredited)
Harry Seymour
Photographer (uncredited)
Huey White
Sarah's Taxi Driver (uncredited)
Jack Wise
Reporter (uncredited)