From the outset, Dr. Ariella Marshall, a hematologist at the Mayo Clinic in Minnesota, began moving forward with the belief that if she worked harder and harder, she would be successful. And she did: She graduated high school as a valedictorian, attended an elite university, and was accepted into a top medical school.

But there was one feat she didn’t achieve: having a child. She had postponed getting pregnant until she was solidly established in her career, but when she finally decided to try having children at age 34, she was surprised to find that she was also on fertility drugs. could not. Dr. Marshall attributed this to frequent night shift work, as well as stress and lack of sleep, which can affect the reproductive cycle.
Source: The New York Times