Twilight sleep fell from favour almost as quickly as it rose to popularity. One of its most vocal advocates died in childbirth (for unrelated reasons). Also, the First World War made anything German, such as the Freiburg method, somewhat unfashionable. The practice didn't entirely disappear, although it ceased to be a fad and became less mainstream. Queen Elizabeth II was said to have used twilight sleep for the births of her first three children.