King James’s treatise on witchcraft, Daemonologie, includes a section on nightmares. Although he strongly believed in the power and danger of witches, he was far more skeptical about dreams. In this treatise, James claims that nightmares result from natural causes rather than from demons, or succubi.
King James also wrote the Basilikon Doron as an educational guide for his son Henry, Prince of Wales. In a section on sleep, he advises Henry to “take no heede to any of your dreames,” because prophecies and visions no longer occur. They ceased with the coming of Christ.
Arthur Wilson's The history of Great Britain includes the story of James I and Richard Haydock, the “Sleeping Preacher,” as the prime example of “brutish imposters” exposed by the king’s reason. Wilson also shared James’ belief that dreams are not supernatural, stating in the preface that he is “not like one in a Dream, who starts at the horror of the Object which his own imagination creates.”