Arthur Koestler describes the geniuses of our universe as people who engage in this activity, while the subtitle of a Charles Brockden Brown novel suggests that Edgar Huntley also does this. The characters Joachim von Pasenow and Huguenau appear in a Hermann Broch trilogy whose title refers to people who do this. Franklin Blake unknowingly does this to steal the title gem 
Arthur Koestler describes the geniuses of our universe as people who engage in this activity, while the subtitle of a Charles Brockden Brown novel suggests that Edgar Huntley also does this. The characters Joachim von Pasenow and Huguenau appear in a Hermann Broch trilogy whose title refers to people who do this. Franklin Blake unknowingly does this to steal the title gem in Wilkie Collins's The Moonstone, while Mina Murray discovers Lucy Westenra doing this in a churchyard in Bram Stoker's Dracula. FTP, identify this nocturnal activity which Lady Macbeth does while trying to wash her hands of her husband's murder.
Arthur Koestler describes the geniuses of our universe as people who engage in this activity, while the subtitle of a Charles Brockden Brown novel suggests that Edgar Huntley also does this.
{sleepwalk}ing [or {somnambulism}, I suppose]