Ann Carter Lee was a victim of narcolesy, a disease that is often call the sleeping disease. I'll let Gail Jarvis finish the story:
"Still, Ann continued to be plagued with poor health, and in 1804 she was taken with a severe fever – possibly dengue fever, and bedridden for months. One day, while in the grip of her illness, the family became alarmed that Ann was not responding to external stimuli. They hastily summoned physicians who conducted lengthy examinations of Ann’s inert body. Finally, the grim-faced physicians were forced to advise her husband that they could not detect a heartbeat. The grief-stricken husband reluctantly accepted the verdict of death and Ann’s body was placed in a coffin. Three days later, the coffin was put to rest in the family vault.
Some time later a sexton, bringing flowers for the deceased wife, thought he heard a noise emanating from the casket. As he listened intently, he was sure that he heard a faint voice calling for help. The sexton quickly unfastened and removed the lid from the coffin and Ann Carter Lee looked up at him with wide eyes as she tried to raise herself into a sitting position.
Over the next several months Ann Carter Lee slowly regained her health. Eventually she was able to become a fully functioning wife and mother. On January 19, 1807, fifteen months after her narrow escape from premature burial, she gave birth to a son who would be her last child to survive into maturity. The infant was named Robert Edward after Ann’s two brothers. Robert Edward was to become another illustrious member of the famous Lee family. "