A lady of my acquaintance, after a slight operation, suffered from insomnia [that] drugs failed to relieve. Her doctor, however, was very resourceful and on visiting her on the Sunday forenoon said: "I see there's a sermon on the wireless at eight this evening..." There is no soporific better than a dry sermon.

From the Doctor's Notebook, Insomnia (p. 202), Duckworth. 1937