People of Vagonbrei
Inhabitants of the mythical place where King Arthur and his fellow knights visited in search of the Sangraal. The entire population perished when an unusual sleep sickness swept through their community. Many believed it was because the villagers, who were aware that Morgan Le Fay lived in nearby caves, gave her location when King Arthur and his men came to investigate. Morgan managed to survive, and in spite, she may have inflicted the people with the sickness.
However, microbiology reveals that parasites were responsible for the sickness. The people of Vagonbrei were well behind this level of sophistication, so many fell asleep -- and died -- in their beds.
Morpheus - SG-1 discovers Vagonbrei and soon learns that every citizen's life ended through a mysterious sleep sickness.