The New York Times is running a lengthy piece in their weekend supplement about sleep disorders. Besides a certain amount of humor value, the article covers sleep terrors and sleepwalking and even weirder disorders.

Suddenly it’s easy to understand what spawned the lore of demons and succubi, those ”old hags” from whom the word nightmare is derived, and the countless other psychoreligious confabulations dreamed up over the centuries since Plato declared that ”in all of us, even good men, there is a lawless wild-beast nature which peers out in sleep.”