Prolific, award-winning author Doris Lessing died in her sleep on Saturday night, her publisher said. She was 94. Lessing, who authored more than 50 works fiction, nonfiction and poetry ranging in subject, won the Nobel prize in 2007 and became the eldest recipient at age 88. Among her well-known works are The Golden Notebook, Memoirs of a Survivor and The Grass is Singing.