Eugene O'Neill's autobiographical play Long Day's Journey into Night is regarded as his finest work. First published by yale university press in 1956, it won the pulitzer prize in 1957 and has since sold more than one mi...Eugene O'Neill's autobiographical play Long Day's Journey into Night is regarded as his finest work. First published by yale university press in 1956, it won the pulitzer prize in 1957 and has since sold more than one million copies. The action covers a fateful, heart-rending day from around 8:30 am to midnight, in August 1912 at the seaside connecticut home of the tyrones - the semi-autobiographical representations of o'Neill himself, his older brother, and their parents at their home, monte cristo cottage.